Long-term Investments [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] BM&F [Member] BM& FBOVESPA SA [Member] BM&FBOVESPA SA [Member] Bolsa Mexicana De Valores, S A B De C V [Member] Bolsa Mexicana De Valores, S A B De C V [Member] Bolsa Mexicana De Valores, S A B De C V 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] Statement [Line Items] Statement [Line Items] Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Fair value of investment Investment Owned, at Fair Value Cost-basis value of investment Investment Owned, at Cost General Discussion of Pension and Other Postretirement Benefits [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans [Member] Pension Plan [Member] Defined Benefit Plan by Plan Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] US Equity [Member] US Equity [Member] US Equity [Member] Foreign Equity [Member] Foreign Equity Mutual Fund [Member] Foreign Equity Mutual Fund [Member] Fixed Income [Member] Fixed Income Funds [Member] Commodity [Member] Commodity [Member] Minimum Defined Benefit Plan, Target Plan Asset Allocations Range Minimum Maximum Defined Benefit Plan, Target Plan Asset Allocations Range Maximum Marketable Securities [Abstract] Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Quarterly Financial Data [Abstract] Quarterly Information Quarterly Financial Information [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Debt Disclosure [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] $750.0 Million Fixed Rate Notes Due February 2014, Interest Equal To 5.75% [Member] Seven Hundred Fifty Million Dollar Fixed Rate Notes Due February Twenty Fourteen, Interest Equal To Five Point Seven Five Percent [Member] $750.0 Million Fixed Rate Notes Due August 2014, Interest Equal To 5.75% $612.5 Million Fixed Rate Notes Due March 2018, Interest Equal To 4.40% [Member] Six Hundred Twelve Point Five Million Fixed Rate Notes Due March Two Thousand Eighteen, Interest Equal To Four Point Four Zero Percent [Member] $612.5 Million Fixed Rate Notes Due March 2018, Interest Equal To 4.40% Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Three Point Zero Percent [Member] [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Three Point Zero Percent [Member] [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Three Point Zero Percent [Member] [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Four Point Three Zero Percent [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Four Point Three Zero Percent [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Twenty Two, Interest Equal To Four Point Three Zero Percent [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Forty Three, Interest Equal To Five Point Three Percent [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Forty Three, Interest Equal To Five Point Three Percent [Member] Seven Hundred Fifty Million Fixed Rate Notes Due March Two Thousand Forty Three, Interest Equal To Five Point Three Percent Debt instrument, fair value Debt Instrument, Fair Value Disclosure Debt instrument, face amount Debt Instrument, Face Amount Debt Instrument, maturity date Debt Instrument, Maturity Date Capital Stock [abstract] Capital Stock [Abstract] 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 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[Member] Software and software development costs Software and Software Development Costs [Member] Property, Plant and Equipment [Line Items] Proceeds from sale of building property Proceeds from Sale of Property, Plant, and Equipment Gain (Loss) on Disposition of Property Plant Equipment Gain (Loss) on Disposition of Property Plant Equipment 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 Income Tax Disclosure [Abstract] Statutory U.S. federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, Deductions, Qualified Production 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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 Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising 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activity Schedule of Goodwill [Table Text Block] Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Financial instruments measured at fair value on a recurring basis Fair Value, Measurement Inputs, Disclosure [Text Block] Reconciliation of assets and liabilities valued at fair value on a recurring basis using significant unobservable inputs (level 3) Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] 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, 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Qualitative or Quantitative Information, Ownership Percentage Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding in Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding in Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding in Shares [Roll Forward] Number of shares outstanding at December 31 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of shares granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Number of shares exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of shares cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Number of shares outstanding at December 31 (shares) Number of shares exercisable at December 31 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average exercise price exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price cancelled Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted average exercise price outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Weighted average remaining contractual life outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value 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] CBOT Holdings Long-Term Equity Plan [Member] CBOT Holdings Long-Term Equity Plan [Member] CBOT Holdings Long-Term Equity Plan [Member] NYMEX Holdings Omnibus Long-Term Incentive Plan [Member] NYMEX Holdings Omnibus Long-Term Incentive Plan [Member] NYMEX Holdings Omnibus Long-Term Incentive Plan [Member] Director Stock Plan; Class A Shares [Member] Director Stock Plan; Class A Shares [Member] Director Stock Plan; Class A Shares [Member] 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] 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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 Fair Value Measurements Fair Value Disclosures [Text Block] Intangible Assets and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Performance Bonds and Guaranty Fund Contributions [Abstract] Performance Bonds And Security Deposits [Abstract] Performance Bonds and Guaranty Fund Contributions Performance Bonds And Security Deposits [TextBlock] Performance Bonds And Security Deposits [TextBlock] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Balance at January 1 Actual return on plan assets Defined Benefit Plan, Actual Return on 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Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 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 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 Investment Type [Axis] Investment Type [Axis] Investment Type [Domain] 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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] Available-for-Sale Securities Fair Value Available-for-sale Securities, Amortized Cost Basis Average daily clearing settlement Average Daily Clearing Settlement Average Daily Clearing Settlement Available-for-sale Securities Available-for-sale Securities Total principal in IEF programs Total principal in IEF programs Total principal in IEF programs Management fees earned under the IEF programs I E F Revenue I E F Revenue 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 Minimum Corporate Contribution Minimum Corporate Contribution Minimum Corporate Contribution Working capital designated for clearance of default in over the counter credit default swap, percent Working Capital Percent For Over the Counter Credit Default Swap, Percent Working Capital Percent For Over the Counter Credit Default Swap, Percent Working capital designated for clearance of default in over the counter interest rate swap Working Capital For Over the Counter Interest Rate Swap Working Capital For Over the Counter Interest Rate Swap 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 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[Domain] Valuation Allowances and Reserves [Domain] Allowance for doubtful accounts Allowance for Doubtful Accounts [Member] Allowance for deferred tax assets Valuation Allowance of Deferred Tax Assets [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of year Valuation Allowances and Reserves, Balance Charged against goodwill Valuation Allowances and Reserves, Reserves of Businesses Acquired Charged (credited) to costs and expenses Valuation Allowances and Reserves, Charged to Cost and Expense Other Valuation Allowances and Reserves, Charged to Other Accounts Balance at end of year 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 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Vesting of issued restricted Class A common stock Vesting Of Issued Restricted Stock Value Vesting Of Issued Restricted Stock Shares issued to Board of Directors (in shares) Stock Issued To Related Parties During Period Shares Number of shares of stock issued during the period to related parties. Shares issued to Board of Directors Stock Issued To Related Parties During Period Value Value of stock issued during the period to related parties. 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by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Operating Leases, Future Minimum Payments Due [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years 2018 Operating Leases, Future Minimum Payments, Due in Four Years 2019 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Unrecorded Unconditional Purchase Obligation [Abstract] Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] 2015 Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months 2016 Unrecorded Unconditional Purchase Obligation, Due within Two Years 2017 Unrecorded Unconditional Purchase Obligation, Due within Three Years 2018 Unrecorded Unconditional Purchase Obligation, Due within Four Years 2019 Unrecorded Unconditional Purchase Obligation, Due within Five Years Thereafter Unrecorded Unconditional Purchase Obligation, Due after Five Years Total Unrecorded Unconditional Purchase Obligation, Total Unrecorded Unconditional Purchase Obligation, Total Noncontrolling Interest [Table] Noncontrolling Interest [Table] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Adjustments to Additional Paid in Capital, Deferred Tax Liabilities Adjustments to Additional Paid in Capital, Deferred Tax Liabilities Adjustments to Additional Paid in Capital, Deferred Tax Liabilities Gain on Purchase of NonControlling Interest Gain on 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[Member] Second Lease Renewal Option [Member] 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] 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 Operating leases renewal option, period (in years) Operating Leases Renewal Option, Period Operating leases renewal option, period Operating leases, rent expense Operating Leases, Rent Expense 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 (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 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 Deferred Income Tax Expense (Benefit) Total Income Tax Provision Organization and Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Tax Authority [Member] Domestic Tax Authority [Member] current [Member] current [Member] current [Member] Noncurrent [Member] Noncurrent [Member] Noncurrent [Member] Domestic unrealized loss on investment in BM&FBOVESPA Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses Deferred Tax Assets, Unrealized Currency Losses Deferred Tax Assets, Unrealized Currency Losses Deferred tax asset Domestic Losses Deferred Tax Assets, Operating Loss Carryforwards, Domestic Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other Deferred Tax Assets, Property, Plant and Equipment Deferred Tax Assets, Property, Plant and Equipment Unrealized loss on securities Deferred Tax Assets, Unrealized Losses on Trading Securities Accrued expenses and other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Subtotal Deferred Tax Assets, Gross, Noncurrent Valuation allowance Deferred Tax Assets, Valuation Allowance, Noncurrent Total non-current deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Purchase intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets Deferred Tax Liabilities, Other Deferred Tax Liabilities, Other Total non-current deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Net Non-Current Deferred Tax Liabilities Deferred Tax Assets, Net, Noncurrent Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Performance Shares [Member] Performance Shares [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Share-based compensation arrangement by share-based payment award, number of shares reserved Share-based compensation arrangement by share-based payment award, number of shares authorized Vesting percentage after one year Vesting Percentage After One Year Vesting percentage after one year Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee service share-based compensation, unrecognized compensation costs on nonvested awards, Weighted Average Period of Recognition, years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock options, granted, shares Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Granted performance shares Restricted Class A common stock, fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Total expense for stock payments Allocated Share-based Compensation Expense Share-based compensation arrangement by share-based payment award, discount from market price Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date Class A common stock issued to participating employees Class A Common Stock Issued To Participating Employees Class A common stock issued to participating employees Annual award of class A common stock value Annual Award Of Class A Common Stock Value Annual award of class A common stock value Annual stipend allowance in shares of stock Annual Stipend Allowance In Shares Of Stock Annual stipend allowance in shares of stock Annual stipend allowance in shares of stock (in shares) Annual Stipend Allowance In Shares Of Stock (In Shares) Annual stipend allowance in shares of stock (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] 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 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 Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Balance at January 1 Defined Benefit Plan, Benefit Obligation Actuarial (gain) loss Defined Benefit Plan, Actuarial Gain (Loss) Benefits paid Balance at December 31 Property Property, Plant and Equipment Disclosure [Text Block] Stock-Based Payments Disclosure of Compensation Related Costs, Share-based Payments [Text Block] 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 Operating Loss Carryforwards Operating Loss Carryforwards unrealized capital tax loss unrealized capital tax loss unrealized capital tax loss Deferred Tax Assets, Valuation Allowance, Noncurrent Long-term deferred tax asset 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 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Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Gain (Loss) on Sale of Property Plant Equipment Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Deferred income taxes Change in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Income tax payable Increase (Decrease) in Income Taxes Payable Other current liabilities Increase (Decrease) in Other Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Other Other Noncash Income (Expense) Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from maturities of available-for-sale marketable securities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchases of available-for-sale marketable securities Payments to Acquire Available-for-sale Securities Purchases of property, net Payments to Acquire Property, Plant, and Equipment Consideration paid in business combinations, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Investments in business ventures Payments to Acquire Investments Loans and Leases Receivable, Related Parties, Additions Loans and Leases Receivable, Related Parties, Additions Proceeds from sale of Credit Market Analysis Ltd., net of cash sold with business ProceedsFromDivestitureOfBusinessNet ProceedsFromDivestitureOfBusinessNet Settlement of derivative related to debt issuance Payments for (Proceeds from) Derivative Instrument, Investing Activities 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 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 Proceeds from exercise of stock options Proceeds from Stock Options Exercised Distribution paid to non-controlling interest Payments to Noncontrolling Interests Excess tax benefits related to employee option exercises and restricted stock vesting Excess Tax Benefit from Share-based Compensation, Financing Activities Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Other Proceeds from (Payments for) Other Financing Activities Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents, End of Period Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Income taxes paid Income Taxes Paid Interest paid (excluding securities lending program) Interest Paid Non-cash investing activities: Cash Flow Noncash Investing Disclosure Abstract Cash Flow, Noncash Investing Disclosure [Abstract] Investment in S&P/Dow Jones Indices LLC Noncash or Part Noncash Acquisition, Investments Acquired Non-cash financing activities: Cash Flow Noncash Financing Activities Disclosure Abstract Cash Flow, Noncash Financing Activities Disclosure [Abstract] dividends declared dividends declared dividends declared Total Revenues Operating Income Non-operating income (expense) Comprehensive Income (Loss) Note [Text Block] Comprehensive Income (Loss) Note [Text Block] 2015 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2016 Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2017 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2018 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Five 2020-2024 Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Schedule of Short-term Debt 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] Fair value of fixed rate notes by maturity date Fair Value Of Fixed Rate Notes By Maturity Date [Text Block] Fair Value Of Fixed Rate Notes By Maturity Date [Text Block] Actual allocation of plan assets, Fixed income Defined Benefit Plan, Actual Plan Asset Allocations Quarterly Information Schedule of Quarterly Financial Information [Table Text Block] Capital stock Schedule of Stock by Class [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and cash equivalents Marketable securities Marketable Securities, Current Accounts receivable, net of allowance of $1.2 and $1.2 Accounts Receivable, Net, Current Other current assets (includes $37.0 and $40.0 in restricted cash) Other Assets, Current Cash performance bonds and guaranty fund contributions Total current assets Assets, Current Property, net of accumulated depreciation and amortization Intangible assets-trading products Goodwill Other assets (includes $72.4 and $74.0 in restricted cash) Other Assets, Noncurrent Total Assets Assets Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Accounts payable Accounts Payable, Current Short-term debt Short-term Non-bank Loans and Notes Payable Other current liabilities Other Liabilities, Current Cash performance bonds and guaranty fund contributions Cash Performance Bonds and Security Deposit Liability The amount due to other broker-dealers in the form of a deposit paid by the counterparty to demonstrate an intention to complete a purchase (good faith deposit) and also the amount due to a customer in the form of collateral deposited by the counterparty to cover the credit risk assumed by the entity (margin deposit). Total current liabilities Liabilities, Current Long-term debt Unsecured Long-term Debt, Noncurrent Deferred tax liabilities, net Other liabilities Other Liabilities, Noncurrent Total Liabilities Liabilities Redeemable non-controlling interest Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value, 10,000 shares authorized, none issued or outstanding Preferred Stock, Value, Issued Common stock Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total Shareholders' Equity Stockholders' Equity Attributable to Parent Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Total Liabilities and Shareholders' Equity Liabilities and Equity Performance bonds Performance Bond Letters Of Credit Performance Bond Letters Of Credit Guaranty Fund Letters of Credit Guaranty Fund Letters of Credit Guaranty Fund Letters of Credit Cross Margin Letters of Credit Cross Margin Letters of Credit Cross Margin Letters of Credit Total Letters of Credit Letters of Credit Letters of Credit Earnings Per Share Earnings Per Share [Text Block] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Accrued liability related to all outstanding legal matters Estimated Litigation Liability Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Foreign Currency Gain (Loss) [Member] Foreign Currency Gain (Loss) [Member] Stockholders' Equity Attributable to Parent Balance at beginning of period Net actuarial gain (loss) Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax Derivative, Net Hedge Ineffectiveness Gain (Loss) Comprehensive Income Reclassification Adjustments Comprehensive Income Reclassification Adjustments Comprehensive Income Reclassification Adjustments Balance at end of period Comprehensive Income Before Reclassification Adjustments Other Comprehensive Income (Loss), before Reclassifications, before Tax Comprehensive Income Reclassification Adjustments Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Tax Debt [Abstract] Debt [Abstract] Short-term Debt Short-term Debt [Abstract] Long-term Debt Long-term Debt, Current and Noncurrent [Abstract] Forward starting interest rate swap agreement fixed rate Forward starting interest rate swap agreement fixed rate Forward starting interest rate swap agreement, fixed rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Compensation expense Income tax benefit recognized Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Statement of Financial Position Parentheticals [Abstract] Statement of Financial Position Parentheticals [Abstract] Series B Preferred Stock [Member] SeriesAJuniorParticipatingPreferredStock [Member] SeriesAJuniorParticipatingPreferredStock [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 Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Family Farmer and Ranchers Protection Fund [Member] Family Farmer and Ranchers Protection Fund [Member] Family Farmer and Ranchers Protection Fund [Member] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] PaymentPerParticipant PaymentPerParticipant PaymentPerParticipant Contingent liability to SGX, amount of irrevocable letters of credit Guarantor Obligations, Collateral Held Directly or by Third Parties PaymentPerCooperative PaymentPerCooperative PaymentPerCooperative FutureLosses FutureLosses FutureLosses Payments under Guarantee Payments under Guarantee Payments under Guarantee Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Effect of derivative instruments on the statements of Income and Shareholders' Equity Derivative Instruments, Gain (Loss) [Table Text Block]