Revenue from providing access fees to customers for the use of electronic trading platform and revenue from telecommunication networks and communication services. Access and communication fees Accounts Payable, Current Accounts payable Accounts receivable, net of allowance of $2.0 and $1.8 Net accretion of discounts and amortization of premiums on marketable securities Net accretion of discounts and amortization of premiums on marketable securities Property, accumulated depreciation and amortization Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss) Additional paid-in capital Amortization of shares issued to Board of Directors Tax benefit of stock issuance costs related to CBOT Holdings merger Tax benefit of stock issuance costs related to CBOT Holdings merger Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation Excess tax benefits from option exercises and restricted stock vesting Adjustments to reconcile net income to net cash provided by operating activities: Accounts receivable, allowance Amendment Flag Net accretion of discounts and amortization of debt financing costs Amortization of purchased intangibles Total Assets Total Assets Assets Total current assets Total current assets Current Assets: 2. Business Combinations Cash and cash equivalents Cash and Cash Equivalents, End of Period Cash and cash equivalents, beginning of period Net change in cash and cash equivalents Net change in cash and cash equivalents Cash Flow, Noncash Financing Activities Disclosure [Abstract] Non-cash financing activities: Cash Flow, Noncash Investing Disclosure [Abstract] Non-cash investing activities: 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). Cash Performance Bonds and Security Deposit Liability Cash performance bonds and security deposits Class of Stock [Domain] Fees earned by providing executing servicing and clearing, net of rebates. Clearing and transaction fees Class A common stock Class A Common Stock (Shares) Common Class B, Class B-1 [Member] Class B common stock, Class B-1 Common Class B, Class B-2 [Member] Class B common stock, Class B-2 Common Class B, Class B-3 [Member] Class B common stock, Class B-3 Common Class B, Class B-4 [Member] Class B common stock, Class B-4 Class B common stock Class B Common Stock (Shares) Cash dividends on common stock, per share Common Stock and Additional Paid-in Capital Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Common stock Communications Total comprehensive income Comprehensive income: Total Expenses Total Expenses Expenses Current Fiscal Year End Date 6. Debt Deferred income taxes Deferred tax liabilities, net Depreciation and amortization 10. Stock-Based Payments Cash dividends on common stock of $3.45 per share in 2009 and $8.45 per share in 2008 Cash dividends on common stock of $3.45 per share in 2009 and $8.45 per share in 2008 The aggregate amount of dividends declared, but not paid, as of the financial reporting date. Dividends declared but unpaid on Class A common stock Document Information [Text Block] Document Period End Date Document Type Earnings per Common Share: Earnings Per Share, Basic Basic Earnings Per Share, Diluted Diluted 12. Earnings Per Common Share Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Filer Category Entity Registrant Name Entity [Text Block] Equity Component [Domain] Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefits from option exercises and restricted stock vesting 11. Fair Value Measurements Fair value of Class A common stock, stock options and restricted stock units issued in connection with NYMEX Holdings merger Fair value of Class A common stock, stock options and restricted stock units issued in connection with NYMEX Holdings merger Gains (losses) on derivative investments Loss on sale of metals trading products Loss on sale of metals trading products Good Faith and Margin Deposits with Broker-Dealers Cash performance bonds and security deposits Goodwill 4. Intangible Assets and Goodwill The charge against earnings resulting from the write down of available for sale security due to the difference between the carrying value and lower fair value. Impairment of securities lending assets Loss recognized during the period that results from the write-down of goodwill and intangibles after comparing the implied fair value of goodwill and intangible assets with the carrying amount of that goodwill and intangible assets. Impairment of goodwill and intangible assets Impairment of long-term investment Impairment of long-term investment Sum of operating profit and nonoperating income (expense) before income taxes. Income before Income Taxes Income before Income Taxes Equity in losses of unconsolidated subsidiaries Equity in losses of unconsolidated subsidiaries Income Statement [Abstract] Income taxes paid Income tax provision Increase (Decrease) in Accounts Payable Accounts payable Accounts receivable Accounts receivable Income taxes payable Guarantee of exercise right privileges Guarantee of exercise right privileges Change in assets and liabilities: Increase (Decrease) in Other Accrued Liabilities Other current liabilities Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Other Operating Liabilities Other liabilities Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Other current assets Technology support services Intangible assets - other, net Interest and other borrowing costs Interest and other borrowing costs Interest paid (excluding securities lending program) Investment income Compensation and benefits Total Liabilities Total Liabilities Total Liabilities and Shareholders' Equity Total Liabilities and Shareholders' Equity Liabilities and Shareholders' Equity Total current liabilities Total current liabilities Current Liabilities: Licensing and other fee agreements Marketable securities, including pledged securities of $50.0 and $283.8 Fees earned by providing subscribers with market information such as current quotes, trade prices, volumes, etc. Quotation data fees Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Investing Activities Net Cash Provided by Operating Activities Net Cash Provided by Operating Activities Cash Flows from Operating Activities Net change in securities lending program liability. Net change in NYMEX securities lending program liabilities Net income Net Income Total Non-Operating Income (Expense) Total Non-Operating Income (Expense) Non-Operating Income (Expense) Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Payable under securities lending agreements Occupancy and building operations Operating Income Operating Income 1. Basis of Presentation Other current assets Other assets Change in net unrealized securities gains (losses) Change in net actuarial loss on defined benefit plans, net of tax of $0.9 in 2009 and $0.2 in 2008 Change in net actuarial loss on defined benefit plans, tax Change in foreign currency translation adjustment, net of tax of $2.2 in 2009 and $4.1 in 2008 Change in foreign currency translation adjustment, tax Change in net unrealized derivatives gains (losses) Change in net unrealized loss on derivatives, net of tax of $2.8 in 2009 and $0.5 in 2008 Change in net unrealized loss on derivatives, tax Change in net unrealized loss/gain on securities, net of tax of $16.3 in 2009 and $7.7 in 2008 Change in net unrealized loss/gain on securities, tax Other Cost and Expense, Operating Other Intangible assets - trading products Disclosures regarding other investments. 5. Long-Term Investments Other Liabilities, Current Other current liabilities Other Liabilities, Noncurrent Other liabilities Other income (expense) Other Sales Revenue, Net Other Cash outflows from payment of membership rights. NYMEX membership rights payments NYMEX membership rights payments Merger-related transaction costs Merger-related transaction costs Purchase of derivative related to BM&FBovespa SA investment Purchase of derivative related to BM&FBovespa SA investment Net change in NYMEX securities lending program investments Net change in NYMEX securities lending program investments Repurchase of Class A common stock, including costs Repurchase of Class A common stock, including costs Cash dividends Cash dividends Purchases of available-for-sale marketable securities Purchases of available-for-sale marketable securities Acquisition of NYMEX Holdings, Inc., net of cash received Acquisition of NYMEX Holdings, Inc., net of cash received Acquisition of Credit Market Analysis Limited, net of cash received Acquisition of Credit Market Analysis Limited, net of cash received Capital contributions to FXMarketSpace Limited Capital contributions to FXMarketSpace Limited Purchases of property, net Purchases of property, net Disclosure of performance bonds and security deposits. 3. Performance Bonds and Security Deposits Preferred stock Preferred stock, par value Preferred stock, shares authorized Preferred stock, issued Preferred stock, outstanding Preferred Stock, Value, Issued Preferred stock Proceeds from maturities of available-for-sale marketable securities Proceeds from other borrowings, net of issuance costs Proceeds (repayments) of commercial paper, net Proceeds from sale of metals trading products Proceeds from exercise of stock options Proceeds from Employee Stock Purchase Plan Processing Service Revenue (revenue from processing transactions conducted on other exchanges). Processing services Professional fees and outside services Property, net of accumulated depreciation and amortization of $525.8 and $479.5 Allowance for doubtful accounts Repayment of other borrowings Repayment of other borrowings Recognition of in-process research and development acquired from Credit Market Analysis Limited 7. Restructuring Restructuring Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings Total Revenues Total Revenues Revenues 9. Guarantees 8. Contingencies 13. Subsequent Events Securities lending interest expense (rebate expense paid back to security borrowers in the securities lending program derived from collateral investment). Securities lending interest and other costs Securities lending interest and other costs Securities lending interest income (interest earned on collateral received through the securities lending program). Securities lending interest income Collateral from securities lending, at fair value Marketable securities, pledged securities Series A junior participating preferred stock Share-based Compensation Stock-based compensation Number of shares of stock held by shareholders. Beginning Balance Ending Balance Beginning Balance Short-term debt Class of Stock [Axis] Statement, Equity Components [Axis] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Stock Granted During Period, Value, Share-based Compensation Stock-based compensation Total Shareholders' Equity Ending Balance Beginning Balance Total Shareholders' Equity Shareholders' Equity: DO NOT USE StockholdersEquityStatementAbstract DO NOT USE StockholdersEquityStatementAbstract Accumulated Other Comprehensive Income (Loss)