Business Combinations [Abstract] Statement [Table] Statement [Table] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] United States of America, Dollars United States of America, Dollars United Kingdom, Pounds United Kingdom, Pounds Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] NEX [Member] NEX [Member] NEX [Member] Statement [Line Items] Statement [Line Items] Business Acquisition, Share Price Business Acquisition, Share Price Share Price Share Price Exchange Rate Exchange Rate Exchange Rate Business Combination, Cash Consideration Business Combination, Cash Consideration Business Combination, Cash Consideration Business Combination, Share exchange ratio Business Combination, Share exchange ratio Business Combination, Share exchange ratio Business Combination, Consideration Transferred Business Combination, Consideration Transferred Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Business Combination, Cash Consideration Payments to Acquire Businesses, Gross Business combination recognized identifiable assets acquired and liabilities assumed, debt Business combination recognized identifiable assets acquired and liabilities assumed, debt Business combination recognized identifiable assets acquired and liabilities assumed, debt Proceeds from Issuance of Debt Proceeds from Issuance of Debt Noncontrolling Interest, Ownership Percentage by Parent Noncontrolling Interest, Ownership Percentage by Parent Business Combination, Separately Recognized Transactions [Table Text Block] Business Combination, Separately Recognized Transactions [Table Text Block] Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Statement of Stockholders' Equity Parentheticals [Abstract] Statement of Stockholders' Equity Parentheticals [Abstract] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Municipal Bonds [Member] Municipal Bonds [Member] Mutual Fund [Member] Mutual Fund [Member] Equity Securities [Member] Equity Securities [Member] Asset-backed Securities [Member] Asset-backed Securities [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Available-for-sale Securities Available-for-sale Securities Trading Securities at Fair Value Debt Securities, Trading, and Equity Securities, FV-NI Investments, Fair Value Disclosure Investments, Fair Value Disclosure Derivative Asset Derivative Asset Total Assets at Fair Value Assets, Fair Value Disclosure Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Financial and Nonfinancial Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Debt Disclosure [Abstract] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Short-term Debt [Line Items] Short-term Debt [Line Items] Schedule of Short-term Debt [Table Text Block] Schedule of Short-term Debt [Table Text Block] Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Long-term debt maturities at par value Schedule of Maturities of Long-term Debt [Table Text Block] Retirement Benefits, Description [Abstract] Summary of the change in projected benefit obligation Schedule of Changes in Projected Benefit Obligations [Table Text Block] Change in plan assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Fair value of plan assets Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Components of net pension expenses and the assumptions used to determine the end-of-year projected benefit obligation and net pension expense in aggregate Schedule of Net Benefit Costs [Table Text Block] Asset allocation for the plan Schedule of Allocation of Plan Assets [Table Text Block] Prior service costs and actuarial losses included in accumulated other comprehensive income (loss) Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Anticipated benefit payments from the plan in future years Schedule of Expected Benefit Payments [Table Text Block] Property, Plant and Equipment, Net [Abstract] Property Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Software and software development costs Software and Software Development Costs [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Leasehold improvements Leasehold Improvements [Member] Building and building improvements Building and Building Improvements [Member] Land and land improvements Land and Land Improvements [Member] Property, Plant and Equipment [Line Items] Property, gross Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, net Property, Plant and Equipment, Net Estimated useful life, minimum Property, Plant and Equipment, Useful Life 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Performance Bonds and Guaranty Fund Contributions [Abstract] Performance Bonds and Guaranty Fund Contributions [Abstract] Performance bonds Performance Bond Letters Of Credit Performance Bond Letters Of Credit Cross-margin arrangements Cross-margin arrangements Cross-margin arrangements Performance collateral for delivery Performance collateral for delivery Performance collateral for delivery Letters of Credit Letters of Credit Letters of Credit Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Plans [Member] Pension Plan [Member] Components of Net Pension Expense: Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Recognized net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net Pension Expense Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Assumptions Used to Determine End-of-Year Benefit Obligation: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Cash balance interest crediting rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Cash Balance Interest Crediting Rate Cash Balance Interest Crediting Rate Assumptions Used to Determine Net Pension Expense: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate Temporary Equity [Abstract] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Capital Stock [abstract] Capital Stock [Abstract] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] CME Group Omnibus Stock Plan [Member] CME Group Omnibus Stock Plan [Member] CME Group Omnibus Stock Plan [Member] Director Stock Plan; Class A Shares [Member] Director Stock Plan; Class A Shares [Member] Director Stock Plan; Class A Shares [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A Common Stock Common Class A [Member] Class B Common Stock, Class B1 [Member] Class B Common Stock, Class B1 [member] Class B Common Stock, Class B1 [Member] Class B Common Stock, Class B2 [Member] Class B Common Stock, Class B2 [member] Class B Common Stock, Class B2 [Member] Class B Common Stock, Class B3 [Member] Class B Common Stock, Class B3 [Member] Class B Common Stock, Class B3 [Member] Class B Common Stock, Class B4 [Member] Class B Common Stock, Class B4 [member] Class B Common Stock, Class B4 [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Age for participation eligibility in benefit plan Eligible Age To Participate In Benefit Plan Eligible age to participate in benefit plan Years of service for vesting eligibility Deferred Compensation Arrangement with Individual, Requisite Service Period Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Excess of pension plan assets over the projected benefit obligation Defined Benefit Plan, Funded (Unfunded) Status of Plan Amortization of actuarial loss from accumulated other comprehensive income (loss) into net periodic benefit costs Defined Benefit Plan, Expected Amortization, Next Fiscal Year Percentage of employees base salary matched by employer, maximum Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Cost Defined Contribution Plan, Cost Trading securities fair value Total contribution Total Contribution Total Contribution Total obligation Total Obligation Total Obligation Fair value of assets Fair Value Of Assets Under Retirement Plan Fair Value Of Assets Under NYMEX Members Retirement Plan And Benefits Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] Employee Stock Purchase Plan; Class A Shares [Member] Employee Stock Purchase Plan; Class A Shares [Member] Employee Stock Purchase Plan; Class A Shares [Member] Class A Common Stock (Shares) [Member] Class B Common Stock (Shares) Common Class B [Member] Class B common stock, Class B1, B2, B3 [Member] Class B common stock, Class B1, B2, B3 [Member] Class B common stock, Class B1, B2, B3 [Member] Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common stock, voting rights Common Stock, Voting Rights Number of directors Number of directors Number of directors Number of shares reserved for awards under the plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Market value of the shares an Employee Stock Purchase Plan Market value of the shares an Employee Stock Purchase Plan Market value of the shares an Employee Stock Purchase Plan Class A shares Purchased under Employee Stock Purchase Plan Employee Stock Ownership Plan (ESOP), Shares in ESOP Statement of Comprehensive Income [Abstract] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Reclassification of gains(loss) on sale included in investment income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Income tax benefit (expense) Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax investment securities, net Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Net change in defined benefit plans arising during the period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Income tax benefit (expense) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Defined benefit plans, net Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net unrealized holding gains (losses) arising during the period Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Amortization of effective portion of net (gains) losses on cash flow hedges included in investment income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Income tax benefit (expense) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Derivative investments, net Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Foreign currency translation, net Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Income tax benefit (expense) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Foreign currency translation, net Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Less: comprehensive income (loss) attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to CME Group Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Investments, Debt and Equity Securities [Abstract] Income Tax Disclosure [Abstract] Gross unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits, net of tax impacts in other jurisdictions Unrecognized Tax Benefits Net Of Tax Impacts In Other Jurisdictions Unrecognized Tax Benefits Net Of Tax Impacts In Other Jurisdictions Interest and penalties related to uncertain tax positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Interest and penalties recognized in the consolidated statements of income Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Commitments and Contingencies Disclosure [Abstract] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Domain] Property Subject to or Available for Operating Lease [Domain] Datacenter [Member] Datacenter [Member] Datacenter [Member] NYMEX [Member] NYMEX [Member] NYMEX [Member] Chicago CBOT Building [Member] [Member] Chicago CBOT Building [Member] [Member] Chicago CBOT Building [Member] [Member] Chicago [Member] Chicago [Member] Chicago [Member] Additional Office Space Chicago [Member] Additional Office Space Chicago [Member] Additional Office Space Chicago [Member] Operating leases number of renewal options Operating Leases Number Of Renewal Options Operating leases number of renewal options Lessee, Operating Lease, Renewal Term Lessee, Operating Lease, Renewal Term Operating leases, rent expense Operating Leases, Rent Expense Marketable Securities [Abstract] Available-for-sale securities Available-for-sale Securities [Table Text Block] Amortized cost and fair value of marketable securities by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Actuarial Losses [Roll Forward] Actuarial Losses [Roll Forward] Actuarial Losses [Roll Forward] Actuarial Loss Beginning Balance Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Actuarial Loss Ending Balance Accounting Policies [Abstract] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Clearing and Transaction Fees [Member] clearing and transaction fees [Member] clearing and transaction fees [Member] Sales Revenue, Market Data and Information Services [Member] Sales Revenue, Market Data and Information Services [Member] Sales Revenue, Market Data and Information Services [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Customer 1 [Member] Customer 1 [Member] Customer 1 [Member] Customer 2 [Member] Customer 2 [Member] Customer 2 [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2018-02 [Member] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Estimated useful live of the assets minimum in years Concentration of revenue Concentration Risk, Percentage Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Unrealized Gain on Securities Unrealized Gain on Securities ImpairmentChargesOnPrivatelyHeldInvestments Other than Temporary Impairment Losses, Investments Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Defined Benefit Plan, Other Cost (Credit) Defined Benefit Plan, Other Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Quarterly Financial Data [Abstract] Quarterly Information Quarterly Financial Information [Table Text Block] Cash and securities held as performance bonds and guaranty fund contributions at fair value Cash And Securities Held As Performance Bonds And Security Deposits At Fair Value [TextBlock] Cash And Securities Held As Performance Bonds And Security Deposits At Fair Value [TextBlock] Letters of credit Schedule of Letters of Credit [Text Block] Schedule of Letters of Credit. Long-term Investments [Abstract] Long-term Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Contingencies Schedule of Loss Contingencies by Contingency [Table Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Clearing Firm, Market Data, and Other Customer Relationships [Member] Customer Relationships [Member] Technology-Related Intellectual Property [Member] Developed Technology Rights [Member] Other Intangible Assets [Member] Other Intangible Assets [Member] Cost Finite-Lived Intangible Assets, Gross Useful life, minimum Finite-Lived Intangible Asset, Useful Life Fair Value Measurements Fair Value Disclosures [Text Block] Balance Sheet Related Disclosures [Abstract] Series A junior participating preferred stock [Member] Series A Preferred Stock [Member] Series B Preferred Stock [Member] SeriesAJuniorParticipatingPreferredStock [Member] SeriesAJuniorParticipatingPreferredStock [Member] Class B Common Stock (Shares) [Member] Allowance for Doubtful Accounts Receivable Allowance for Doubtful Accounts Receivable Restricted Cash and Cash Equivalents, Current Restricted Cash and Cash Equivalents, Current Restricted Cash and Cash Equivalents, Noncurrent Restricted Cash and Cash Equivalents, Noncurrent Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, Shares, Issued Common Stock, Shares, Issued Revenue Recognition and Deferred Revenue [Abstract] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Transferred over Time [Member] Transferred over Time [Member] Transferred at Point in Time [Member] Transferred at Point in Time [Member] One-time charges and miscellaneous revenues [Member] One-time charges and miscellaneous revenues [Member] One-time charges and miscellaneous revenues [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate [Member] Interest Rate [Member] Interest Rate [Member] Equities [Member] Equities [Member] Equities [Member] Foreign Exchange [Member] Foreign Exchange [Member] Agricultural commodity [Member] Agricultural commodity [Member] Agricultural commodity [Member] Energy [Member] Energy [Member] Energy [Member] Metal [Member] Metal [Member] Metal [Member] Over the Counter [Member] Over the Counter [Member] Cash Markets [Member] Cash Markets [Member] Cash Markets [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] MarketData [Member] MarketData [Member] MarketData [Member] OtherRevenue [Member] OtherRevenue [Member] OtherRevenue [Member] Total Revenues Revenues Revenue Revenue from Contract with Customer, Excluding Assessed Tax Deferred Revenue Deferred Revenue Operating Income Operating Income (Loss) Non-operating income (expense) Nonoperating Income (Expense) Income from before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net income attributable to CME Group Net Income (Loss) Attributable to Parent Earnings per Common Share Attributable to CME Group: Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Weighted Average Number of Common Shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Taxes on income Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation of the statutory U.S. federal income tax rate to the effective tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Deferred tax assets (liabilities) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Unrecognized tax benefits Summary of Income Tax Contingencies [Table Text Block] Reconciliation of unrecognized tax benefits Reconciliation Of Unrecognized Tax Benefits [Text Block] Reconciliation Of Unrecognized Tax Benefits Share-based Compensation [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of shares outstanding at December 31 (shares) Number of shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of shares cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Number of shares outstanding at December 31 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Weighted average grant date fair value outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Investment Type [Axis] Investment Type [Axis] Investment Type [Domain] Investments [Domain] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained Earnings [Member] Retained Earnings [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options [Member] Employee Stock Option [Member] Restricted Stock [Member] Restricted Stock [Member] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted Earnings per common share, basic Earnings per common share, diluted Outstanding anti-dilutive options Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] 2019 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2024-2028 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Statutory U.S. federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Operating Loss Carryforwards Operating Loss Carryforwards Deferred Tax Assets, Valuation Allowance, Noncurrent Deferred Tax Assets, Valuation Allowance, Noncurrent Long-term deferred tax asset Deferred Tax Assets, Gross, Noncurrent Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] €350.0 million fixed rate notes due March 2019 [Member] €350.0 million fixed rate notes due March 2019 [Member] €350.0 million fixed rate notes due March 2019 [Member] ¥19.1 billion term loan due March 2019 [Member] ¥19.1 billion term loan due March 2019 [Member] ¥19.1 billion term loan due March 2019 [Member] $750.0 million Fixed Rate Notes Due September 2022 Interest Equal To 3.00% [Member] $750.0 million Fixed Rate Notes Due September 2022 Interest Equal To 3.00% [Member] $750.0millionFixedRateNotesDueSeptember2022InterestEqualTo3.00% €15.0 million fixed rate notes due May 2023 [Member] €15.0 million fixed rate notes due May 2023 [Member] €15.0 million fixed rate notes due May 2023 [Member] $750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member] $750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Five, Interest Equal To Three Point Zero Percent [Member] [Member] [Member] $500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain] $500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain] $500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain] $750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member] $750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member] $750.0millionFixedRateNotesDueSeptember2043InterestEqualTo5.3% $700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain] $700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain] $700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain] Commercial Paper [Member] Commercial Paper [Member] Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Entity [Abstract] Entity [Abstract] Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Summary of the Property Accounts Property, Plant and Equipment [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Reporting Unit [Axis] Reporting Unit [Axis] Reporting Unit [Domain] Reporting Unit [Domain] Goodwill [Line Items] Goodwill [Line Items] Goodwill Disclosure [Text Block] Goodwill Disclosure [Text Block] Debt instrument, face amount Debt Instrument, Face Amount Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, maturity date Debt Instrument, Maturity Date commercial paper days outstanding commercial paper days outstanding commercial paper days outstanding Weighted Average Discount Rate, Percent Weighted Average Discount Rate, Percent debt weighted average balance debt weighted average balance debt weighted average balance Earnings Per Share Earnings Per Share [Text Block] Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Bursa Malaysia Derivatives Berhad [Member] Bursa Malaysia Derivatives Berhad [Member] Bursa Malaysia Derivatives Berhad [Member] DME Holdings [Member] DME Holdings [Member] DME Holdings [Member] S&P/DJI [Member] SandPDJI [Member] SandPDJI [Member] Equity Method Investments Equity Method Investments Euro [Member] Euro Member Countries, Euro Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Cash [Member] Cash [Member] Derivative, Fixed Interest Rate Derivative, Fixed Interest Rate Long-term Debt Long-term Debt, Current and Noncurrent [Abstract] Long-term debt Unsecured Long-term Debt, Noncurrent Debt Instrument, Interest Rate During Period Debt Instrument, Interest Rate During Period Performance Bonds and Guaranty Fund Contributions Performance Bonds And Security Deposits [TextBlock] Performance Bonds And Security Deposits [TextBlock] Guarantees [Abstract] 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Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Stock-based compensation Stock Granted, Value, Share-based Compensation, Net of Forfeitures Stockholders' Equity, ending Nonredeemable Noncontrolling Interest, ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, ending balance Ending Balance (in shares) Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation Share-based Compensation Amortization of purchased intangibles Amortization of Intangible Assets Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Asset Impairment Charges Asset Impairment Charges Gain on sale of BM&FBOVESPA Shares Debt and Equity Securities, Gain (Loss) Gain on sale of Bolsa Mexicana de Valores, S.A.B. de C.V. 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Proceeds from Sale and Maturity of Other Investments Cash paid to acquire NEX, net of cash received Payments to Acquire Businesses, Net of Cash Acquired Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from Issuance of Commercial Paper, net of issuances Proceeds from Issuance of Commercial Paper Proceeds from other borrowings, net of issuance costs Proceeds from Issuance of Long-term Debt Repayment of other borrowings Repayments of Other Debt Cash dividends Payments of Dividends Premium payment for derivative contract Payments for Derivative Instrument, Financing Activities Proceeds from exercise of stock options Proceeds from Stock Options Exercised Proceeds from lease financing obligation Sale Leaseback Transaction, Gross Proceeds, Financing Activities Excess tax benefits related to employee option exercises and restricted stock vesting Excess Tax Benefit from Share-based Compensation, Financing Activities Employee taxes paid on restricted stock vesting Payments Related to Tax Withholding for Share-based Compensation Other Proceeds from (Payments for) Other Financing Activities Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, beginning balance Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, ending balance Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Income taxes paid Income Taxes Paid Interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Common stock issued for acquisition of NEX Noncash or Part Noncash Acquisition, Investments Acquired dividends declared dividends declared dividends declared Finite-Lived Intangible Assets [Member] Finite-Lived Intangible Assets [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade Names [Member] Trade Names [Member] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net book value Finite-Lived Intangible Assets, Net Indefinite-lived Intangible Assets Indefinite-lived Intangible Assets (Excluding Goodwill) Other Indefinite-lived Intangible Assets Other Indefinite-lived Intangible Assets Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Components of intangible assets Intangible Assets Disclosure [Text Block] Weighted average useful life for the amortizable intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Future estimated amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Accounting Changes and Error Corrections [Abstract] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Marketable securities Marketable Securities, Current Accounts receivable, net of allowance Accounts Receivable, Net, Current Other current assets Other Assets, Current Performance bonds and guaranty fund contributions Good Faith and Margin Deposits with Broker-Dealers Total current assets Assets, Current Property, net of accumulated depreciation and amortization Intangible assets-trading products Intangible assets-other, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total Assets Assets Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Accounts payable Accounts Payable, Current Short-term debt Short-term Debt Other current liabilities Other Liabilities, Current Performance bonds and guaranty fund contributions Margin Deposits And Guaranty Funds Liabilities Current Margin Deposits And Guaranty Funds Liabilities Current. 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Unconditional Purchase Obligation, Due within Two Years 2021 Unrecorded Unconditional Purchase Obligation, Due within Three Years 2022 Unrecorded Unconditional Purchase Obligation, Due within Four Years 2023 Unrecorded Unconditional Purchase Obligation, Due within Five Years Thereafter Unrecorded Unconditional Purchase Obligation, Due after Five Years Total Unrecorded Unconditional Purchase Obligation Derivative, Notional Amount Derivative, Notional Amount Available-for-sale Securities Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Schedule of future minimum payments under non-cancelable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of other commitments Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding in Shares [Roll Forward] Share-based Compensation Arrangement by Share-based 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Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value outstanding, ending Aggregate intrinsic value exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Capital Stock Capital Stock [Text Block] Capital Stock [Text Block] Compensation expense for stock-based payments and total income tax benefit recognized Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Schedule of Nonvested Share Activity [Table Text Block] Stock-Based Payments Disclosure of Compensation Related Costs, Share-based Payments [Text Block] 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Benefit Plan, Benefit Obligation, Benefits Paid Balance at December 31 Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Federal Reserve Reinvestment [Member] Federal Reserve Reinvestment [Member] Federal Reserve Reinvestment [Member] Guaranty Fund [Axis] Guaranty Fund [Axis] Guaranty Fund [Axis] Guaranty Fund [Domain] Guaranty Fund [Domain] [Domain] for Guaranty Fund [Axis] CME Base Guaranty Fund [Member] CME Base Guaranty Fund [Member] CME Base Guaranty Fund [Member] CME IRS Guaranty Fund [Member] [Member] CME IRS Guaranty Fund [Member] [Member] CME IRS Guaranty Fund [Member] [Member] Line of Credit Facility [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] 364-day fully secured, committed line of credit Line of Credit Facility, Fully Secured Committed [Member] Line of Credit Facility, Fully Secured Committed [Member] Revolving senior credit facility Letter of Credit Facility, Revolving Senior Credit Facility [Member] Letter of Credit Facility, Revolving Senior Credit Facility [Member] Cash Equivalents, at Carrying Value Cash Equivalents, at Carrying Value Average daily clearing settlement Average Daily Clearing Settlement Average Daily Clearing Settlement Total principal in IEF programs Total principal in IEF programs Total principal in IEF programs Percentage share of cross-margining collateral Percentage Share of Cross-margining Collateral Percentage Share of Cross-margining Collateral Corporate Contribution Corporate Contribution Corporate Contribution Guaranty Fund Contributions Guaranty Fund Contributions Guaranty Fund Contributions Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit, Guaranty Fund Collateral Available Line of Credit, Guaranty Fund Collateral Available Line of Credit, Guaranty Fund Collateral Available Option on increase in line of credit Line of Credit Facility, Option to Increase, Maximum Borrowing Capacity Line of Credit Facility, Option to Increase, Maximum Borrowing Capacity Days fully secured Committed Line Of Credit Number Of Days Fully Secured Committed Line Of Credit Number Of Days Fully Secured Intraday settlements of cash performance bonds Intraday settlements of cash performance bonds Intraday settlements of cash performance bonds Income before income taxes: Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Income before income taxes: Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Income from before income taxes Current income tax provision: Federal Current Federal Tax Expense (Benefit) Current income tax provision: State Current State and Local Tax Expense (Benefit) Current income tax provision: Foreign Current Foreign Tax Expense (Benefit) Current income tax provision: Total Current Income Tax Expense (Benefit) Deferred income tax provision: Federal Deferred Federal Income Tax Expense (Benefit) Deferred income tax provision: State Deferred State and Local Income Tax Expense (Benefit) Deferred income tax provision: Foreign Deferred Foreign Income Tax Expense (Benefit) Deferred income tax provision: Total Total Income Tax Provision Income Tax Expense (Benefit) State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, Deduction, Other, Percent Effective Income Tax Rate Reconciliation, Domestic Production Activities Deduction Effective Income Tax Rate Reconciliation, Domestic Production Activities Deduction Increase (decrease) in domestic valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Impact of revised state apportionment estimates Effective Tax Rate, Impact of Revised State Appointment Estimates Effective Tax Rate, Impact of Revised State Appointment Estimates effective tax rate reconciliation reclassification of comprehensive income effective tax rate reconciliation reclassification of comprehensive income effective tax rate reconciliation reclassification of comprehensive income Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Tax Rate Effective Income Tax Rate Reconciliation, Percent Debt Debt Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Net book value Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Income Statement [Abstract] Revenues Revenues [Abstract] Expenses Costs and Expenses [Abstract] Compensation and benefits Labor and Related Expense Technology Information Technology and Data Processing Professional fees and outside services Professional Fees LicensingFees LicensingFees LicensingFees Other Other Cost and Expense, Operating Total Expenses Costs and Expenses Operating Income Non-Operating Income (Expense) Nonoperating Income (Expense) [Abstract] Investment income Investment Income, Nonoperating Interest and other borrowing costs Interest and Debt Expense Equity in net (gains) losses of unconsolidated subsidiaries Income (Loss) from Equity Method Investments Other income (expense) Other Nonoperating Income (Expense) Total Non-Operating Income tax provision Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Fair Value Measurements, Nonrecurring Value Measurement [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Level 3 Discount Rate Fair Value Level 3 discount rate Fair Value Level 3 discount rate Other Asset Impairment Charges Other Asset Impairment Charges Fair Value Hedge Liabilities Fair Value Hedge Liabilities Actual allocation of plan assets, Fixed income Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Commitments Commitments Disclosure [Text Block] Non-Cash Deposits and IEF Funds [Member] Securities and IEF Funds [Member] Securities and IEF Funds [Member] Performance bonds Performance bonds Performance bonds Total 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis] Fair Value Plan Asset Measurement [Domain] Defined Benefit Plan, Cash [Member] Defined Benefit Plan, Cash [Member] US Equity [Member] Defined Benefit Plan, Equity Securities, US [Member] Foreign equity [Member] Defined Benefit Plan, Equity Securities, Non-US [Member] Defined Benefit Plan, Plan Assets, Amount