CME (CME) 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 11, 2017
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2,017
Entity Registrant Name	CME GROUP INC.
Entity Central Index Key	1,156,375
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		340,291,358
Class B Common Stock, Class B-1 [Member]
Entity Common Stock, Shares Outstanding		625
Class B Common Stock, Class B-2 [Member]
Entity Common Stock, Shares Outstanding		813
Class B Common Stock, Class B-3 [Member]
Entity Common Stock, Shares Outstanding		1,287
Class B Common Stock, Class B-4 [Member]
Entity Common Stock, Shares Outstanding		413

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents		$ 1,631.1	$ 1,868.6
Marketable securities		88	83.3
Accounts receivable, net of allowance of $1.4 and $3.5		390.3	364.4
Other current assets (includes $50.0 and $30.0 in restricted cash)		340.8	171.7
Performance bonds and guaranty fund contributions		46,942.3	37,543.5
Total current assets		49,392.5	40,031.5
Property, net of accumulated depreciation and amortization of $649.9 and $597.2		388.9	425.2
Intangible assets—trading products	[1]	17,175.3	17,175.3
Intangible assets—other, net		2,370	2,441.8
Goodwill		7,569	7,569
Other assets (includes $2.2 and $61.7 in restricted cash)		1,427.3	1,726.6
Total Assets		78,323	69,369.4
Liabilities and Equity
Accounts payable		36.1	26.2
Other current liabilities		244.6	1,376.7
Performance bonds and guaranty fund contributions		46,942.3	37,542.7
Total current liabilities		47,223	38,945.6
Long-term debt		2,232.6	2,231.2
Deferred income tax liabilities, net		7,437	7,291
Other liabilities		566.5	560.9
Total Liabilities		57,459.1	49,028.7
Shareholders' Equity:
Preferred stock, $0.01 par value, 10,000 shares authorized at September 30, 2017 and December 31, 2016; none issued		0	0
Additional paid-in capital		17,874.6	17,826.9
Retained earnings		2,973.8	2,524.5
Accumulated other comprehensive income (loss)		12.1	(14.1)
Total shareholders’ equity		20,863.9	20,340.7
Total Liabilities and Equity		78,323	69,369.4
Class A Common Stock [Member]
Shareholders' Equity:
Common stock		3.4	3.4
Class B Common Stock [Member]
Shareholders' Equity:
Common stock		$ 0	$ 0
[1]	)Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable, allowance	$ 1.4	$ 3.5
Restricted cash, current	50	30
Accumulated depreciation and amortization, property	649.9	597.2
Restricted cash, noncurrent	$ 2.2	$ 61.7
Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Class A Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	339,115	338,240
Common stock, shares outstanding (in shares)	339,115	338,240
Class B Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3	3
Common stock, shares issued (in shares)	3	3
Common stock, shares outstanding (in shares)	3	3

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Clearing and transaction fees	$ 756.2	$ 704.2	$ 2,340.2	$ 2,267.9
Market data and information services	96.9	101.1	289.8	306.4
Access and communication fees	25.7	23.8	74.9	67.7
Other	12	12.6	39.8	40.3
Total Revenues	890.8	841.7	2,744.7	2,682.3
Expenses
Compensation and benefits	141.4	130.6	423	394.2
Communications	6.1	6.9	18.4	19.9
Technology support services	19.3	17.3	56.2	52.4
Professional fees and outside services	25.8	33.5	83	104.2
Amortization of purchased intangibles	23.8	24	71.8	72
Depreciation and amortization	26.9	31.2	85.1	95.5
Occupancy and building operations	19.8	19.6	59.1	65.3
Licensing and other fee agreements	41.5	31.5	108.2	103.3
Other	18.3	21.8	65.2	113
Total Expenses	322.9	316.4	970	1,019.8
Operating Income	567.9	525.3	1,774.7	1,662.5
Non-Operating Income (Expense)
Investment income	139.9	36.5	391.2	71.3
Interest and other borrowing costs	(29.1)	(31.1)	(87.9)	(91.9)
Equity in net earnings (losses) of unconsolidated subsidiaries	33.9	28.6	96.5	82.4
Other non-operating income (expense)	(105.3)	(10.5)	(222.9)	(30.9)
Total Non-Operating Income (Expense)	39.4	23.5	176.9	30.9
Income before Income Taxes	607.3	548.8	1,951.6	1,693.4
Income tax provision	298.7	76	827.4	532.7
Net Income	$ 308.6	$ 472.8	$ 1,124.2	$ 1,160.7
Earnings per Common Share:
Basic (in dollars per share)	$ 0.91	$ 1.40	$ 3.32	$ 3.44
Diluted (in dollars per share)	$ 0.91	$ 1.39	$ 3.31	$ 3.43
Weighted Average Number of Common Shares:
Basic (in shares)	338,771	337,592	338,557	337,299
Diluted (in shares)	340,329	339,143	340,114	338,834

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 308.6	$ 472.8	$ 1,124.2	$ 1,160.7
Other comprehensive income (loss), net of tax:
Net unrealized holding gains (losses) arising during the period	(1)	(17.7)	30.1	177.7
Reclassification of net (gains) losses on sales included in investment income	(2)	(6.3)	(89.1)	(6.3)
Income tax benefit (expense)	1.6	(65.3)	77.7	(65.9)
Investment securities, net	(1.4)	(89.3)	18.7	105.5
Net change in defined benefit plans arising during the period	0	0	0.5	3.1
Amortization of net actuarial (gains) losses included in compensation and benefits expense	0.7	0.8	2.1	2.4
Income tax benefit (expense)	(1.2)	(0.3)	(1.9)	(2.1)
Defined benefit plans, net	(0.5)	0.5	0.7	3.4
Amortization of effective portion of net (gains) losses on cash flow hedges included in interest expense	(0.3)	(0.3)	(0.9)	(0.9)
Income tax benefit (expense)	0.1	0.1	0.3	0.3
Derivative investments, net	(0.2)	(0.2)	(0.6)	(0.6)
Foreign currency translation adjustments	0.9	(0.6)	10.3	(5.6)
Income tax benefit (expense)	0	(0.8)	(2.9)	1
Foreign currency translation, net	0.9	(1.4)	7.4	(4.6)
Other comprehensive income (loss), net of tax	(1.2)	(90.4)	26.2	103.7
Comprehensive Income	$ 307.4	$ 382.4	$ 1,150.4	$ 1,264.4

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock And Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Class A Common Stock [Member]	Class A Common Stock [Member]Common Stock And Additional Paid-In Capital [Member]	Class B Common Stock [Member]	Class B Common Stock [Member]Common Stock And Additional Paid-In Capital [Member]
Balance (in shares) at Dec. 31, 2015						336,938		3
Balance at December 31, 2016 at Dec. 31, 2015	$ 20,551.8	$ 17,725	$ 2,907.6	$ (80.8)
Net income	1,160.7		1,160.7
Other comprehensive income (loss), net of tax	103.7			103.7
Dividends on common stock	(609.7)		(609.7)
Exercise of stock options (in shares)						434
Exercise of stock options	29.5	29.5
Excess tax benefits from option exercises and restricted stock vesting	10	10
Vesting of issued restricted Class A common stock, in shares						570
Vesting of issued restricted Class A common stock	(26.8)	(26.8)
Stock-based compensation	42.3	42.3
Balance (in shares) at Sep. 30, 2016						337,978		3
Balance at September 30, 2017 at Sep. 30, 2016	21,264.9	17,783.4	3,458.6	22.9
Stock Issued To Related Parties During Period Shares						26
Stock Issued To Related Parties During Period Value	2.5	2.5
Stock Issued During Period, Shares, Employee Stock Purchase Plans						10
Stock Issued During Period, Value, Employee Stock Purchase Plan	0.9	0.9
Balance (in shares) at Dec. 31, 2016					338,240	338,240	3	3
Balance at December 31, 2016 at Dec. 31, 2016	20,340.7	17,830.3	2,524.5	(14.1)
Net income	1,124.2		1,124.2
Other comprehensive income (loss), net of tax	26.2			26.2
Dividends on common stock	(672.7)		(672.7)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(0.8)	1.4	(2.2)
Exercise of stock options (in shares)						345
Exercise of stock options	30.4	30.4
Vesting of issued restricted Class A common stock, in shares						501
Vesting of issued restricted Class A common stock	(30.5)	(30.5)
Stock-based compensation	42.8	42.8
Balance (in shares) at Sep. 30, 2017					339,115	339,115	3	3
Balance at September 30, 2017 at Sep. 30, 2017	20,863.9	17,878	$ 2,973.8	$ 12.1
Stock Issued To Related Parties During Period Shares						20
Stock Issued To Related Parties During Period Value	2.4	2.4
Stock Issued During Period, Shares, Employee Stock Purchase Plans						9
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 1.2	$ 1.2

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock, per share (in dollars per share)	$ 1.98	$ 1.80

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income	$ 1,124.2	$ 1,160.7
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	42.8	42.3
Amortization of purchased intangibles	71.8	72
Depreciation and amortization	85.1	95.5
Gain on sale of BM&FBOVESPA shares	(86.5)	(6.4)
Gain (Loss) on Sale of Other Investments	(2)	0
Reclassification from AOCI, Current Period, Tax	87.8	0
Loss on datacenter	0	27.1
Undistributed earnings, net of losses, of unconsolidated subsidiaries	(33.2)	(29.3)
Deferred income taxes	129.7	(79.3)
Change in:
Accounts receivable	(23.8)	(18.7)
Other current assets	(27.6)	(12.5)
Other assets	59.5	9.5
Accounts payable	10	5.7
Income taxes payable	(86.2)	21.3
Other current liabilities	(23.3)	(40.5)
Other liabilities	2.9	(14.3)
Other	(1)	(0.7)
Net Cash Provided by Operating Activities	1,330.2	1,232.4
Cash Flows from Investing Activities
Proceeds from maturities of available-for-sale marketable securities	2.3	40.1
Purchases of available-for-sale marketable securities	(2.3)	(44.9)
Purchases of available-for-sale marketable securities	(53)	(62.9)
Investments in business ventures	(5.3)	(4.9)
Proceeds from Sale of Other Assets, Investing Activities	0	8.8
Proceeds from sale of BM&FBOVESPA shares	244	0
Proceeds from Sale and Maturity of Other Investments	15.1	0
Net Cash Provided by (Used in) Investing Activities	200.8	(63.8)
Cash Flows from Financing Activities
Cash dividends	(1,769.6)	(1,584.3)
Proceeds from finance lease obligation	0	130
Proceeds from exercise of stock options	30.4	29.5
Excess tax benefits related to employee option exercises and restricted stock vesting	0	10
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(30.5)	(26.8)
Proceeds from (Payments for) Other Financing Activities	1.2	0.9
Net Cash Used in Financing Activities	(1,768.5)	(1,440.7)
Net change in cash and cash equivalents	(237.5)	(272.1)
Cash and cash equivalents, beginning of period	1,868.6	1,692.6
Cash and Cash Equivalents, End of Period	1,631.1	1,420.5
Supplemental Disclosure of Cash Flow Information
Income taxes paid	642.7	545.5
Interest paid	84.8	84.8
Accrued Proceeds from Sale of Investment	$ 1.4	$ 20.8

Basis Of Presentation

Basis Of Presentation	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	Basis of Presentation The consolidated financial statements consist of CME Group Inc. (CME Group) and its subsidiaries (collectively, the company), including Chicago Mercantile Exchange Inc. (CME), Board of Trade of the City of Chicago, Inc. (CBOT), New York Mercantile Exchange, Inc. (NYMEX), Commodity Exchange, Inc. (COMEX), CME Clearing Europe Limited (CMECE) and CME Europe Limited (CME Europe). CME, CBOT, NYMEX, COMEX, CMECE and CME Europe and their subsidiaries are referred to collectively as “the exchange” in the notes to the consolidated financial statements. The clearing houses include CME Clearing, which is the U.S. clearing house and a division of CME, and CMECE. The accompanying interim consolidated financial statements have been prepared by CME Group without audit. Certain notes and other information normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. In the opinion of management, the accompanying consolidated financial statements include all normal recurring adjustments considered necessary to present fairly the financial position of the company at September 30, 2017 and December 31, 2016 and the results of operations and cash flows for the periods indicated. Quarterly results are not necessarily indicative of results for any subsequent period. The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in CME Group’s Annual Report on Form 10-K for the year ended December 31, 2016 , filed with the Securities and Exchange Commission (SEC) on February 27, 2017.

Accounting Policies (Notes)

Accounting Policies (Notes)	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Accounting Changes [Text Block]	Accounting Policies Newly Adopted Accounting Policies. In March 2016, the Financial Accounting Standards Board (FASB) issued a standards update that changes certain aspects of accounting for share-based payments to employees. The guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also allows an employer to repurchase more of an employee’s shares for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. The company implemented this standards update as of January 1, 2017 on a prospective basis. Starting in the first quarter of 2017, all income tax effects of awards are recognized in the income statement as part of income tax expense when the awards vest or are settled. During the first nine months of 2017, the company recognized a net tax benefit of $11.5 million related to the income tax effects of awards as part of income tax expense. The company also adopted a policy to recognize forfeitures as compensation expense as the forfeitures occur. Previously, the company estimated the number of awards that would be forfeited and recognized the estimate as part of compensation expense. This policy change was adopted on a modified retrospective basis with a cumulative-effect adjustment to additional paid in capital and retained earnings as of January 1, 2017. The excess tax benefits are now reported as an operating activity within the change in income taxes payable instead of a financing activity on the statements of cash flows. Prior periods have not been adjusted for this change. The employee taxes paid by the company when the company withholds shares for tax-withholding purposes when restricted stock awards vest are now classified as a financing activity on the statements of cash flows. Prior periods have been adjusted for this change. Recently Issued Accounting Pronouncements. In May 2014, the FASB issued a new standard on revenue recognition that replaces numerous, industry-specific requirements and converges U.S. accounting standards with International Financial Reporting Standards. The new standard introduces a framework for recognizing revenue that focuses on the transfer of control rather than risks and rewards. The new standard also requires significant additional disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments, changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The application of the new standard becomes effective in the first annual period beginning after December 15, 2017, with early adoption permitted. This guidance may be adopted using one of two transition methods: retrospectively to each prior reporting period presented (full retrospective method) or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial adoption (the modified retrospective approach). Management is on course to comply with the guidance by the effective date as the project team has completed the contract review and implementation phases. Based on the assessment, management expects the impact to the financial statements and internal controls environment to be immaterial. Management also notes that adoption of the guidance will result in expanded disclosures within the footnotes. In January 2016, the FASB issued a standards update that will change how entities measure certain equity investments. It does not change the guidance for classifying and measuring investments in debt securities and loans. Under the new guidance, entities will have to measure many equity investments at fair value and recognize any changes in fair value in net income, unless the investments qualify for a practicability exception. Entities will no longer be able to recognize unrealized holding gains and losses on equity securities classified today as available for sale in other comprehensive income. The update is effective for reporting periods beginning after December 15, 2017. Early adoption is permitted. The company is still in the process of evaluating the impact of this update on the consolidated financial statements. In February 2016, the FASB issued a standards update that requires lessees to recognize on the balance sheet the assets and liabilities associated with the rights and obligations created by those leases. The guidance for lessors is largely unchanged from current U.S. GAAP. Under the new guidance, a lessee will be required to recognize assets and liabilities for leases with terms of more than 12 months. Consistent with current U.S. GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. The update is effective for reporting periods beginning after December 15, 2018. Early adoption is permitted. The company is in the process of evaluating the impact of this update on the consolidated financial statements. In June 2016, the FASB issued guidance that changes how credit losses are measured for most financial assets measured at amortized cost and certain other instruments. The standard requires an entity to estimate its lifetime expected credit loss and record an allowance, that when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. This forward-looking expected loss model generally will result in the earlier recognition of allowances for losses. The standard also amends the impairment model for available for sale debt securities and requires entities to determine whether all or a portion of the unrealized loss on an available for sale debt security is a credit loss. Severity and duration of the unrealized loss are no longer permissible factors in concluding whether a credit loss exists. Entities will recognize improvements to estimated credit losses on available for sale debt securities immediately in earnings rather than as interest income over time. The standard is effective for reporting periods beginning after December 15, 2019. The standard’s provisions must be applied as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. Early adoption is permitted for reporting periods beginning in 2019. The company is in the process of evaluating the impact of this standard on the consolidated financial statements. In November 2016, the FASB issued a standards update aimed at promoting consistency in the classification and presentation of changes in restricted cash on the statement of cash flows. Previously, there was diversity in practice as to whether the change in restricted cash was included in the reconciliation of beginning-of-period and end-of-period total cash amounts shown on the statement of cash flows. The amendments require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, as well as amounts described as restricted cash on the balance sheet. This guidance is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted. The amendments must be applied using a retrospective transition method to each period presented. The company is in the process of evaluating the impact of this update on our consolidated financial statements. In March 2017, the FASB issued a standards update that will change certain presentation and disclosure requirements for employers that sponsor defined benefit pension as well as other postretirement benefit plans. Under current accounting rules, defined benefit pension cost and postretirement benefit cost (net benefit cost) comprise several components that reflect different aspects of an employer’s financial arrangements as well as the cost of benefits provided to the employees. Those components are aggregated for reporting in the financial statements within compensation and benefits on the income statement. The amendments in the update require that the service cost component is reported in the same line as other compensation costs, whereas the other components of net benefit cost are required to be presented in the income statement separately from the service cost component. The amendments are effective for reporting periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued. The company is in the process of evaluating the impact of this update on the consolidated financial statements. In August 2017, the FASB issued a standards update that amends the existing hedge accounting model to enable entities to better reflect their risk management activities in the financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in fair value hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. The guidance is effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. We do not believe that the adoption of this standard will have a material impact on our consolidated financial statements.

Performance Bonds and Guaranty

Performance Bonds and Guaranty Fund Contributions (Notes)	9 Months Ended
	Sep. 30, 2017
Performance Bonds and Guaranty Fund Contributions [Abstract]
Performance Bonds and Guaranty Fund Contributions	Performance Bonds and Guaranty Fund Contributions Performance Bonds and Guaranty Fund Contributions. CME has been designated as a systemically important financial market utility by the Financial Stability Oversight Council and is authorized to establish and maintain a cash account at the Federal Reserve Bank of Chicago. At September 30, 2017 , CME maintained $38.1 billion within the cash account at the Federal Reserve Bank of Chicago. Clearing House Contract Settlement. CME Clearing and CMECE mark-to-market open positions for all futures and options contracts twice a day (once a day for CME's cleared-only credit default swap and interest rate swap contracts). Based on values derived from the mark-to-market process, CME Clearing and CMECE require payments from clearing firms whose positions have lost value and make payments to clearing firms whose positions have gained value. Under the extremely unlikely scenario of simultaneous default by every clearing firm who has open positions with unrealized losses, the maximum exposure related to positions other than cleared-only credit default and interest rate swap contracts would be one half day of changes in fair value of all open positions, before considering the clearing houses' ability to access defaulting clearing firms' collateral deposits. For CME's cleared-only credit default swap (CDS) and interest rate swap contracts, the maximum exposure related to CME Clearing's guarantee would be one full day of changes in fair value of all open positions, before considering CME Clearing's ability to access defaulting clearing firms' collateral. It is noted that CME is committed to exiting the company's CDS clearing business by mid-2018. During the transition, CME will continue to provide full clearing services so that participants can continue to manage their risk. In connection with the CMECE and CME Europe wind down announced in April 2017, all CMECE client guaranty fund contributions have been returned to the clearing firms as of September 30, 2017. The guarantee fund balance as recorded in other current assets represents $50.0 million of company capital retained in the guaranty fund for transition purposes as of September 30, 2017. During the first nine months of 2017, CME Clearing and CMECE transferred an average of approximately $2.4 billion a day through their clearing systems for settlement from clearing firms whose positions had lost value to clearing firms whose positions had gained value. CME Clearing and CMECE reduce their guarantee exposure through initial and maintenance performance bond requirements and mandatory guaranty fund contributions. The company believes that its guarantee liability is immaterial and therefore has not recorded any liability at September 30, 2017 .

Intangible Assets And Goodwill

Intangible Assets And Goodwill	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets And Goodwill	Intangible Assets Intangible assets consisted of the following at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (in millions) Assigned Value Accumulated Amortization Net Book Value Assigned Value Accumulated Amortization Net Book Value Amortizable Intangible Assets: Clearing firm, market data and other customer relationships $ 2,838.8 $ (920.1 ) $ 1,918.7 $ 2,838.8 $ (849.2 ) $ 1,989.6 Technology-related intellectual property 29.4 (29.4 ) — 29.4 (28.6 ) 0.8 Other 2.4 (1.1 ) 1.3 2.4 (1.0 ) 1.4 Total amortizable intangible assets $ 2,870.6 $ (950.6 ) 1,920.0 $ 2,870.6 $ (878.8 ) 1,991.8 Indefinite-Lived Intangible Assets: Trade names 450.0 450.0 Total intangible assets – other, net $ 2,370.0 $ 2,441.8 Trading products (1) $ 17,175.3 $ 17,175.3 (1) Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits. Total amortization expense for intangible assets was $23.8 million for the quarter ended September 30, 2017 and $ 24.0 million for the quarter ended September 30, 2016 . Total amortization expense for intangible assets was $71.8 million for the nine months ended September 30, 2017 and $ 72.0 million for the nine months ended September 30, 2016 . As of September 30, 2017 , the future estimated amortization expense related to amortizable intangible assets is expected to be as follows: (in millions) Amortization Expense Remainder of 2017 $ 23.7 2018 94.7 2019 94.7 2020 94.7 2021 94.7 2022 94.7 Thereafter 1,422.8

Long-Term Investments (Notes)

Long-Term Investments (Notes)	9 Months Ended
	Sep. 30, 2017
Investments, All Other Investments [Abstract]
Investment [Text Block]	Long-Term Investments The company maintains various long-term investments as included in other assets in the consolidated balance sheets. In January 2017, the company sold its remaining 43.4 million shares of BM&FBOVESPA S.A. (BM&FBOVESPA) and recognized a net gain of $86.5 million , net of transaction costs, within investment income on the consolidated statements of income. In conjunction with the final sale of shares, the company reclassified income tax expense of $87.8 million from accumulated other comprehensive income to the income tax provision. In the third quarter of 2017, the company sold 9.9 million shares of Bolsa Mexicana de Valores, S.A.B de C.V. (Bolsa Mexicana) and recognized a net gain of $2.0 million , net of transaction costs, within investment income on the consolidated statements of income. As of September 30, 2017, the company owned an approximate 0.3% interest in Bolsa Mexicana. At September 30, 2017, the fair value and cost basis of the remaining investment in Bolsa Mexicana was $3.1 million and $2.7 million respectively.

Debt

Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Debt	Debt Long-term debt consisted of the following at September 30, 2017 and December 31, 2016 : (in millions) September 30, 2017 December 31, 2016 $750.0 million fixed rate notes due September 2022, stated rate of 3.00% (1) $ 745.8 $ 745.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% (2) 744.7 744.2 $750.0 million fixed rate notes due September 2043, stated rate of 5.30% (3) 742.1 741.8 Total long-term debt $ 2,232.6 $ 2,231.2 (1) In August 2012, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.32% . (2) In December 2014, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.11% . (3) In August 2012, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73% . Long-term debt maturities, at par value, were as follows at September 30, 2017 : (in millions) Par Value 2018 $ — 2019 — 2020 — 2021 — 2022 750.0 Thereafter 1,500.0

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2017
Loss Contingency [Abstract]
Contingencies	Contingencies Legal and Regulatory Matters. In 2013, the CFTC filed suit against NYMEX and two former employees alleging disclosure of confidential customer information in violation of the Commodity Exchange Act. NYMEX’s motion to dismiss was denied in 2014. Based on its investigation to date and advice from legal counsel, the company believes that it has strong factual and legal defenses to the claim. In 2003, the U.S. Futures Exchange, L.L.C. (Eurex U.S.) and U.S. Exchange Holdings, Inc. filed suit in federal court alleging that CBOT and CME violated the antitrust laws and tortuously interfered with the business relationship and contract between Eurex U.S. and The Clearing Corporation. While the complaint requests treble damages, the plaintiffs have not specified the amount of damages sought. After years of relative inactivity, the case was recently reassigned to a new judge and a trial date was set for April 9, 2018. Based on its investigation to date and advice from legal counsel, the company believes that it has strong factual and legal defenses to the claim. Given the uncertainty of factors which may potentially impact the resolution of the matter, at this time the company is unable to estimate the reasonably possible loss or range of reasonably possible losses in the unlikely event it were found to be liable at trial in the matter. In the normal course of business, the company discusses matters with its regulators raised during regulatory examinations or otherwise subject to their inquiry and oversight. These matters could result in censures, fines, penalties or other sanctions. Management believes the outcome of any resulting actions will not have a material impact on its consolidated financial position or results of operations. However, the company is unable to predict the outcome or the timing of the ultimate resolution of these matters, or the potential fines, penalties or injunctive or other equitable relief, if any, that may result from these matters. In addition, the company is a defendant in, and has potential for, various other legal proceedings arising from its regular business activities. While the ultimate results of such proceedings against the company cannot be predicted with certainty, the company believes that the resolution of any of these matters on an individual or aggregate basis will not have a material impact on its consolidated financial position or results of operations. No accrual was required for legal and regulatory matters that were probable and estimable as of September 30, 2017 and December 31, 2016 . Intellectual Property Indemnifications. Certain agreements with customers and other third parties related to accessing the CME Group platforms, utilizing market data services and licensing CME SPAN software may contain indemnifications from intellectual property claims that may be made against them as a result of their use of the applicable products and/or services. The potential future claims relating to these indemnifications cannot be estimated and therefore no liability has been recorded.

Guarantees

Guarantees	9 Months Ended
	Sep. 30, 2017
Guarantees [Abstract]
Guarantees	Guarantees Mutual Offset Agreement. CME and Singapore Exchange Limited (SGX) have a mutual offset agreement with a current term through October 2018. This agreement enables market participants to open a futures position on one exchange and liquidate it on the other. The term of the agreement will automatically renew for a one -year period unless either party provides advance notice of their intent to terminate. CME must maintain U.S. Treasury securities or irrevocable, standby letters of credit as collateral for this agreement. At September 30, 2017 , CME was contingently liable to SGX on letters of credit totaling $285.0 million . Regardless of the collateral, CME guarantees all cleared transactions submitted through SGX and would initiate procedures designed to satisfy these financial obligations in the event of a default, such as the use of performance bonds and guaranty fund contributions of the defaulting clearing firm. The company believes that its guarantee liability is immaterial and therefore has not recorded any liability at September 30, 2017 . Family Farmer and Rancher Protection Fund. In 2012, the company established the Family Farmer and Rancher Protection Fund (the Fund). The Fund is designed to provide payments, up to certain maximum levels, to family farmers, ranchers and other agricultural industry participants who use the company's agricultural commodity products and who suffer losses to their segregated account balances due to their CME clearing member becoming insolvent. Under the terms of the Fund, farmers and ranchers are eligible for up to $25,000 per participant. Farming and ranching cooperatives are eligible for up to $100,000 per cooperative. The Fund was established with a maximum of $100.0 million available for distribution to participants. Since its establishment, the Fund has made payments of approximately $2.0 million , which leaves $98.0 million available for future claims. If, at any time, payments due to participants were to exceed the amount remaining in the fund, payments would be pro-rated. Clearing members and customers must register with the company in advance and provide certain documentation in order to substantiate their eligibility. The company believes that its guarantee liability is immaterial and therefore has not recorded any liability at September 30, 2017 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Notes)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss): (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2016 $ (19.5 ) $ (37.8 ) $ 58.9 $ (15.7 ) $ (14.1 ) Other comprehensive income (loss) before reclassifications and income tax benefit (expense) 30.1 0.5 — 10.3 40.9 Amounts reclassified from accumulated other comprehensive income (loss) (89.1 ) 2.1 (0.9 ) — (87.9 ) Income tax benefit (expense) 77.7 (1.9 ) 0.3 (2.9 ) 73.2 Net current period other comprehensive income (loss) 18.7 0.7 (0.6 ) 7.4 26.2 Balance at September 30, 2017 $ (0.8 ) $ (37.1 ) $ 58.3 $ (8.3 ) $ 12.1 (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2015 $ (95.0 ) $ (36.6 ) $ 59.6 $ (8.8 ) $ (80.8 ) Other comprehensive income (loss) before reclassifications and income tax benefit (expense) 177.7 3.1 — (5.6 ) 175.2 Amounts reclassified from accumulated other comprehensive income (loss) (6.3 ) 2.4 (0.9 ) — (4.8 ) Income tax benefit (expense) (65.9 ) (2.1 ) 0.3 1.0 (66.7 ) Net current period other comprehensive income (loss) 105.5 3.4 (0.6 ) (4.6 ) 103.7 Balance at September 30, 2016 $ 10.5 $ (33.2 ) $ 59.0 $ (13.4 ) $ 22.9

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Fair Value Measurements	Fair Value Measurements The company uses a three-level classification hierarchy of fair value measurements for disclosure purposes. • Level 1 inputs, which are considered the most reliable evidence of fair value, consist of quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 inputs consist of observable market data, such as quoted prices for similar assets and liabilities in active markets, or inputs other than quoted prices that are directly observable. • Level 3 inputs consist of unobservable inputs which are derived and cannot be corroborated by market data or other entity-specific inputs. Level 1 assets generally include investments in publicly traded mutual funds, equity securities and corporate debt securities with quoted market prices. In general, the company uses quoted prices in active markets for identical assets to determine the fair value of marketable securities and equity investments. If quoted prices are not available to determine fair value, the company uses other inputs that are directly observable. Assets included in level 2 generally consist of asset-backed securities. Asset-backed securities were measured at fair value based on matrix pricing using prices of similar securities with similar inputs such as maturity dates, interest rates and credit ratings. Financial assets recorded in the consolidated balance sheet as of September 30, 2017 were classified in their entirety based on the lowest level of input that was significant to each asset's fair value measurement. There were no liabilities that were measured at fair value as of September 30, 2017 . The following tables present financial instruments measured at fair value on a recurring basis: September 30, 2017 (in millions) Level 1 Level 2 Level 3 Total Assets at Fair Value: Marketable securities: Corporate debt securities $ 20.8 $ — $ — $ 20.8 Mutual funds 66.8 — — 66.8 Equity securities 0.1 — — 0.1 Asset-backed securities — 0.3 — 0.3 Total Marketable Securities 87.7 0.3 — 88.0 Equity investments 3.1 — — 3.1 Total Assets at Fair Value $ 90.8 $ 0.3 $ — $ 91.1 There were no transfers of assets or liabilities between level 1, level 2 and level 3 during the first nine months of 2017 . There were no level 3 assets or liabilities valued at fair value on a recurring or non-recurring basis during the first nine months of 2017. The following presents the estimated fair values of long-term debt notes, which are carried at amortized cost on the consolidated balance sheets. The fair values, which are classified as level 2 under the fair value hierarchy, were estimated using quoted market prices. At September 30, 2017 , the fair values were as follows: (in millions) Fair Value $750.0 million fixed rate notes due September 2022, stated rate of 3.00% $ 771.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% 763.4 $750.0 million fixed rates notes due September 2043, stated rate of 5.30% 954.0

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income attributable to the company by the weighted average number of shares of all classes of CME Group common stock outstanding for each reporting period. Diluted earnings per share reflects the increase in shares using the treasury stock method to reflect the impact of an equivalent number of shares of common stock if stock options were exercised and restricted stock awards were converted into common stock. Anti-dilutive stock options, restricted stock and performance share awards were as follows for the periods presented: Quarter Ended Nine Months Ended (in thousands) 2017 2016 2017 2016 Stock options — 311 — 315 Restricted stock and performance shares 438 530 438 530 Total 438 841 438 845 The following table presents the earnings per share calculation for the periods presented: Quarter Ended Nine Months Ended 2017 2016 2017 2016 Net Income (in millions) $ 308.6 $ 472.8 $ 1,124.2 $ 1,160.7 Weighted Average Number of Common Shares (in thousands): Basic 338,771 337,592 338,557 337,299 Effect of stock options, restricted stock and performance shares 1,558 1,551 1,557 1,535 Diluted 340,329 339,143 340,114 338,834 Earnings per Common Share: Basic $ 0.91 $ 1.40 $ 3.32 $ 3.44 Diluted 0.91 1.39 3.31 3.43

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The company has evaluated subsequent events through the date the financial statements were issued. The company has determined that there were no subsequent events that require disclosure except the following: Following a request for de-authorization submitted by the company in September 2017, CME Europe has received confirmation from the Financial Conduct Authority (FCA) that its status as a recognized investment exchange (RIE) has been revoked effective October 12, 2017. CMECE has received confirmation from the Bank of England that revocation of its status as a European Market Infrastructure Regulation (EMIR) authorized central counterparty clearing house (CCP) and UK recognized CCP was effective October 12, 2017.

Intangible Assets And Goodwill

Intangible Assets And Goodwill (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Components of intangible assets	Intangible assets consisted of the following at September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (in millions) Assigned Value Accumulated Amortization Net Book Value Assigned Value Accumulated Amortization Net Book Value Amortizable Intangible Assets: Clearing firm, market data and other customer relationships $ 2,838.8 $ (920.1 ) $ 1,918.7 $ 2,838.8 $ (849.2 ) $ 1,989.6 Technology-related intellectual property 29.4 (29.4 ) — 29.4 (28.6 ) 0.8 Other 2.4 (1.1 ) 1.3 2.4 (1.0 ) 1.4 Total amortizable intangible assets $ 2,870.6 $ (950.6 ) 1,920.0 $ 2,870.6 $ (878.8 ) 1,991.8 Indefinite-Lived Intangible Assets: Trade names 450.0 450.0 Total intangible assets – other, net $ 2,370.0 $ 2,441.8 Trading products (1) $ 17,175.3 $ 17,175.3 (1) Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits
Future estimated amortization expense	As of September 30, 2017 , the future estimated amortization expense related to amortizable intangible assets is expected to be as follows: (in millions) Amortization Expense Remainder of 2017 $ 23.7 2018 94.7 2019 94.7 2020 94.7 2021 94.7 2022 94.7 Thereafter 1,422.8

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule Of Short-Term And Long-Term Debt	Long-term debt consisted of the following at September 30, 2017 and December 31, 2016 : (in millions) September 30, 2017 December 31, 2016 $750.0 million fixed rate notes due September 2022, stated rate of 3.00% (1) $ 745.8 $ 745.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% (2) 744.7 744.2 $750.0 million fixed rate notes due September 2043, stated rate of 5.30% (3) 742.1 741.8 Total long-term debt $ 2,232.6 $ 2,231.2 (1) In August 2012, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.32% . (2) In December 2014, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.11% . (3) In August 2012, the company entered into a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73% .
Long-term debt maturities at par value	Long-term debt maturities, at par value, were as follows at September 30, 2017 : (in millions) Par Value 2018 $ — 2019 — 2020 — 2021 — 2022 750.0 Thereafter 1,500.0

Accumulated Other Comprehensi23

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss): (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2016 $ (19.5 ) $ (37.8 ) $ 58.9 $ (15.7 ) $ (14.1 ) Other comprehensive income (loss) before reclassifications and income tax benefit (expense) 30.1 0.5 — 10.3 40.9 Amounts reclassified from accumulated other comprehensive income (loss) (89.1 ) 2.1 (0.9 ) — (87.9 ) Income tax benefit (expense) 77.7 (1.9 ) 0.3 (2.9 ) 73.2 Net current period other comprehensive income (loss) 18.7 0.7 (0.6 ) 7.4 26.2 Balance at September 30, 2017 $ (0.8 ) $ (37.1 ) $ 58.3 $ (8.3 ) $ 12.1 (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2015 $ (95.0 ) $ (36.6 ) $ 59.6 $ (8.8 ) $ (80.8 ) Other comprehensive income (loss) before reclassifications and income tax benefit (expense) 177.7 3.1 — (5.6 ) 175.2 Amounts reclassified from accumulated other comprehensive income (loss) (6.3 ) 2.4 (0.9 ) — (4.8 ) Income tax benefit (expense) (65.9 ) (2.1 ) 0.3 1.0 (66.7 ) Net current period other comprehensive income (loss) 105.5 3.4 (0.6 ) (4.6 ) 103.7 Balance at September 30, 2016 $ 10.5 $ (33.2 ) $ 59.0 $ (13.4 ) $ 22.9

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Financial instruments measured at fair value on a recurring basis	The following tables present financial instruments measured at fair value on a recurring basis: September 30, 2017 (in millions) Level 1 Level 2 Level 3 Total Assets at Fair Value: Marketable securities: Corporate debt securities $ 20.8 $ — $ — $ 20.8 Mutual funds 66.8 — — 66.8 Equity securities 0.1 — — 0.1 Asset-backed securities — 0.3 — 0.3 Total Marketable Securities 87.7 0.3 — 88.0 Equity investments 3.1 — — 3.1 Total Assets at Fair Value $ 90.8 $ 0.3 $ — $ 91.1
Fair value of Debt Instruments	At September 30, 2017 , the fair values were as follows: (in millions) Fair Value $750.0 million fixed rate notes due September 2022, stated rate of 3.00% $ 771.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% 763.4 $750.0 million fixed rates notes due September 2043, stated rate of 5.30% 954.0

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	Anti-dilutive stock options, restricted stock and performance share awards were as follows for the periods presented: Quarter Ended Nine Months Ended (in thousands) 2017 2016 2017 2016 Stock options — 311 — 315 Restricted stock and performance shares 438 530 438 530 Total 438 841 438 845
Basic And Diluted Earnings Per Share	The following table presents the earnings per share calculation for the periods presented: Quarter Ended Nine Months Ended 2017 2016 2017 2016 Net Income (in millions) $ 308.6 $ 472.8 $ 1,124.2 $ 1,160.7 Weighted Average Number of Common Shares (in thousands): Basic 338,771 337,592 338,557 337,299 Effect of stock options, restricted stock and performance shares 1,558 1,551 1,557 1,535 Diluted 340,329 339,143 340,114 338,834 Earnings per Common Share: Basic $ 0.91 $ 1.40 $ 3.32 $ 3.44 Diluted 0.91 1.39 3.31 3.43

Accounting Policies (Details)

Accounting Policies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Accounting Changes and Error Corrections [Abstract]
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 11.5

Performance Bonds and Guarant27

Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
Restricted cash, current	$ 50	$ 30
Average Daily Clearing Settlement	2,400
Federal Reserve Reinvestment [Member]
Guarantor Obligations [Line Items]
Cash Equivalents, at Carrying Value	$ 38,100

Intangible Assets And Goodwil28

Intangible Assets And Goodwill (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of purchased intangibles	$ 23.8	$ 24	$ 71.8	$ 72

Intangible Assets And Goodwil29

Intangible Assets And Goodwill (Components Of Intangible Assets) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets		$ 2,370	$ 2,441.8
Other Indefinite-lived Intangible Assets	[1]	17,175.3	17,175.3
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets		450	450
Clearing Firm, Market Data And Other Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2,838.8	2,838.8
Accumulated amortization		(920.1)	(849.2)
Net book value		1,918.7	1,989.6
Technology-Related Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		29.4	29.4
Accumulated amortization		(29.4)	(28.6)
Net book value		0	0.8
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2.4	2.4
Accumulated amortization		(1.1)	(1)
Net book value		1.3	1.4
Total Amortizable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2,870.6	2,870.6
Accumulated amortization		(950.6)	(878.8)
Net book value		$ 1,920	$ 1,991.8
[1]	)Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits.

Intangible Assets And Goodwil30

Intangible Assets And Goodwill (Future Estimated Amortization Expense) (Details) $ in Millions	Sep. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 23.7
2,018	94.7
2,019	94.7
2,020	94.7
2,021	94.7
2,022	94.7
Thereafter	$ 1,422.8

Long-Term Investments (Details)

Long-Term Investments (Details) - USD ($) shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Reclassification from AOCI, Current Period, Tax	$ 87.8	$ 0
BM& FBOVESPA SA [Member]
Investment shares sold	43.4
Reclassification from AOCI, Current Period, Tax	$ 87.8
Gain on Sale of Investments	86.5
Bolsa Mexicana De Valores, S A B De C V [Member]
Investment Owned, at Fair Value	$ 3.1
Investment shares sold	9.9
Ownership Percentage	0.30%
Investment Owned, at Cost	$ 2.7
Gain on Sale of Investments	$ 2

Debt (Schedule Of Short-Term An

Debt (Schedule Of Short-Term And Long-Term Debt) (Details) - USD ($) $ in Millions	1 Months Ended			9 Months Ended
	Mar. 31, 2015	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt				$ 2,232.6	$ 2,231.2
Forward starting interest rate swap agreement fixed rate	3.11%	4.73%	3.32%
$750.0 million fixed rate notes due March 2025, stated rate of 3.00% [Member]
Debt Instrument [Line Items]
Long-term debt				744.7	744.2
Debt Instrument, Face Amount				$ 750
Debt Instrument, Maturity Date				Mar. 1, 2025
Debt Instrument, Interest Rate, Stated Percentage				3.00%
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% [Member]
Debt Instrument [Line Items]
Long-term debt				$ 742.1	741.8
Debt Instrument, Face Amount				$ 750
Debt Instrument, Maturity Date				Sep. 1, 2043
Debt Instrument, Interest Rate, Stated Percentage				5.30%
$750.0 million fixed rate notes due September 2022, stated rate of 3.00% [Member]
Debt Instrument [Line Items]
Long-term debt				$ 745.8	$ 745.2
Debt Instrument, Face Amount				$ 750
Debt Instrument, Maturity Date				Sep. 1, 2022
Debt Instrument, Interest Rate, Stated Percentage				3.00%

Debt (Schedule Of Maturities Of

Debt (Schedule Of Maturities Of Long-Term Debt) (Details) $ in Millions	Sep. 30, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 0
2,019	0
2,020	0
2,021	0
2,022	750
Thereafter	$ 1,500

Guarantees (Details)

Guarantees (Details)	9 Months Ended
	Sep. 30, 2017USD ($)years
Guarantor Obligations [Line Items]
Agreement automatic renewal period (in years) | years	1
Contingent liability to SGX, amount of irrevocable letters of credit	$ 285,000,000
Family Farmer and Ranchers Protection Fund [Member]
Guarantor Obligations [Line Items]
Payment per participant	25,000
Payment per cooperative	100,000
FutureLosses	100,000,000
Payments under Guarantee	2,000,000
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 98,000,000

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Balance at December 31, 2016			$ 20,340.7	$ 20,551.8
Other comprehensive income (loss), net of tax	$ (1.2)	$ (90.4)	26.2	103.7
Balance at September 30, 2017	20,863.9	21,264.9	20,863.9	21,264.9
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at December 31, 2016			(14.1)	(80.8)
Comprehensive Income Before Reclassification Adjustments			40.9	175.2
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(87.9)	(4.8)
Other Comprehensive Income (Loss), Tax			73.2	(66.7)
Other comprehensive income (loss), net of tax			26.2	103.7
Balance at September 30, 2017	12.1	22.9	12.1	22.9
Foreign Currency Translation [Member]
Balance at December 31, 2016			(15.7)	(8.8)
Comprehensive Income Before Reclassification Adjustments			10.3	(5.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0	0
Other Comprehensive Income (Loss), Tax			(2.9)	1
Other comprehensive income (loss), net of tax			7.4	(4.6)
Balance at September 30, 2017	(8.3)	(13.4)	(8.3)	(13.4)
Derivative Investments [Member]
Balance at December 31, 2016			58.9	59.6
Comprehensive Income Before Reclassification Adjustments			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(0.9)	(0.9)
Other Comprehensive Income (Loss), Tax			0.3	0.3
Other comprehensive income (loss), net of tax			(0.6)	(0.6)
Balance at September 30, 2017	58.3	59	58.3	59
Defined Benefit Plans [Member]
Balance at December 31, 2016			(37.8)	(36.6)
Comprehensive Income Before Reclassification Adjustments			0.5	3.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			2.1	2.4
Other Comprehensive Income (Loss), Tax			(1.9)	(2.1)
Other comprehensive income (loss), net of tax			0.7	3.4
Balance at September 30, 2017	(37.1)	(33.2)	(37.1)	(33.2)
Investment Securities [Member]
Balance at December 31, 2016			(19.5)	(95)
Comprehensive Income Before Reclassification Adjustments			30.1	177.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(89.1)	(6.3)
Other Comprehensive Income (Loss), Tax			77.7	(65.9)
Other comprehensive income (loss), net of tax			18.7	105.5
Balance at September 30, 2017	$ (0.8)	$ 10.5	$ (0.8)	$ 10.5

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] $ in Millions	Sep. 30, 2017USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	$ 88
Investment Owned, at Fair Value	3.1
Total Assets at Fair Value	91.1
Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	20.8
Exchange Traded Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities at Fair Value	66.8
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0.1
Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0.3
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	87.7
Investment Owned, at Fair Value	3.1
Total Assets at Fair Value	90.8
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	20.8
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities at Fair Value	66.8
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0.1
Fair Value, Inputs, Level 1 [Member] | Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0.3
Investment Owned, at Fair Value	0
Total Assets at Fair Value	0.3
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities at Fair Value	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0
Fair Value, Inputs, Level 2 [Member] | Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0.3
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	0
Investment Owned, at Fair Value	0
Total Assets at Fair Value	0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading Securities at Fair Value	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	0
Fair Value, Inputs, Level 3 [Member] | Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities at Fair Value	$ 0

Fair Value Measurements (Estima

Fair Value Measurements (Estimated Fair Values of Long-Term Debt) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
$750.0 million fixed rate notes due September 2022, stated rate of 3.00% [Member]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Maturity Date	Sep. 1, 2022
Debt Instrument, Interest Rate, Stated Percentage	3.00%
$750.0 million fixed rate notes due March 2025, stated rate of 3.00% [Member]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Maturity Date	Mar. 1, 2025
Debt Instrument, Interest Rate, Stated Percentage	3.00%
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% [Member]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Maturity Date	Sep. 1, 2043
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due September 2022, stated rate of 3.00% [Member]
Debt Instrument, Fair Value Disclosure	$ 771.2
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due March 2025, stated rate of 3.00% [Member]
Debt Instrument, Fair Value Disclosure	763.4
Fair Value, Inputs, Level 2 [Member] | $750.0 million fixed rate notes due September 2043, stated rate of 5.30% [Member]
Debt Instrument, Fair Value Disclosure	$ 954

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	438	841	438	845
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	311	0	315
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	438	530	438	530

Earnings Per Share (Net Income

Earnings Per Share (Net Income Attributable To CME Group) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 308.6	$ 472.8	$ 1,124.2	$ 1,160.7
Basic (in shares)	338,771	337,592	338,557	337,299
Dilutive Securities, Effect on EPS	1,558	1,551	1,557	1,535
Diluted (in shares)	340,329	339,143	340,114	338,834
Earnings per common share, basic (in dollars per share)	$ 0.91	$ 1.40	$ 3.32	$ 3.44
Earnings per common share, diluted (in dollars per share)	$ 0.91	$ 1.39	$ 3.31	$ 3.43