CME (CME) 10-Q4 Aug 142014 Q2 Quarterly reportFinancial data

Company Profile

Document_And_Entity_Informatio

Document And Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 16, 2014	Jul. 16, 2014	Jul. 16, 2014	Jul. 16, 2014	Jul. 16, 2014
	Jun. 30, 2014	Class A Common Stock [Member]	Class B Common Stock, Class B-1 [Member]	Class B Common Stock, Class B-2 [Member]	Class B Common Stock, Class B-3 [Member]	Class B Common Stock, Class B-4 [Member]
Document Type	'10-Q	'	'	'	'	'
Amendment Flag	'false	'	'	'	'	'
Document Period End Date	30-Jun-14	'	'	'	'	'
Document Fiscal Period Focus	'Q2	'	'	'	'	'
Document Fiscal Year Focus	'2014	'	'	'	'	'
Entity Registrant Name	'CME GROUP INC.	'	'	'	'	'
Entity Central Index Key	'0001156375	'	'	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'	'	'
Entity Filer Category	'Large Accelerated Filer	'	'	'	'	'
Entity Common Stock, Shares Outstanding	'	336,019,336	625	813	1,287	413

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Assets	'		'
Cash and cash equivalents	$1,037.30		$2,469.70
Marketable securities	72.9		68.4
Accounts receivable, net of allowance of $0.9 and $1.2	334.9		302.7
Other current assets (includes $37.0 and $40.0 in restricted cash)	196.2		209.7
Cash performance bonds and guaranty fund contributions	20,089.90		21,355.10
Total current assets	21,731.20		24,405.60
Property, net of accumulated depreciation and amortization of $722.6 and $678.4	503.4		513.4
Intangible assets - trading products	17,175.30	[1]	17,175.30	[1]
Intangible assets - other, net	2,690.90		2,741.20
Goodwill	7,569		7,569
Other assets (includes $77.2 and $74.0 in restricted cash)	1,941.50		1,873.30
Total Assets	51,611.30		54,277.80
Liabilities and Shareholders' Equity	'		'
Accounts payable	32.1		36.2
Short-term debt	0		749.9
Other current liabilities	254.7		1,169.80
Cash performance bonds and guaranty fund contributions	20,089.90		21,355.10
Total current liabilities	20,376.70		23,311
Long-term debt	2,107.50		2,107.20
Deferred income tax liabilities, net	7,271.90		7,249.70
Other liabilities	389.8		449.4
Total Liabilities	30,145.90		33,117.30
Shareholders' Equity:	'		'
Preferred stock, $0.01 par value, 10,000 shares authorized, none issued or outstanding	0		0
Additional paid-in capital	17,545.60		17,504.90
Retained earnings	3,709.80		3,494.60
Accumulated other comprehensive income (loss)	206.7		152
Total Shareholders' Equity	21,465.40		21,154.80
Non-controlling interest	0		5.7
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	21,465.40		21,160.50
Total Liabilities and Shareholders' Equity	51,611.30		54,277.80
Class A Common Stock [Member]	'		'
Shareholders' Equity:	'		'
Common stock	3.3		3.3
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 revenues are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the CFTC. Product authorizations from the CFTC have no term limits.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, except Share data in Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts receivable, allowance	$0.90	$1.20
Restricted cash, current	37	40
Accumulated depreciation and amortization, property	722.6	678.4
Restricted cash, noncurrent	$77.20	$74
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
Series A Junior Participating Preferred Stock [Member]	'	'
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized (in shares)	0	0
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)	334,251	333,852
Common stock, shares outstanding (in shares)	334,251	333,852
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_Inc

Consolidated Statements Of Income (USD $)	3 Months Ended		6 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	'	'	'	'
Clearing and transaction fees	$609.30	$692.50	$1,261.50	$1,285.70
Market data and information services	89.6	79.4	179	160.3
Access and communication fees	20.4	20.6	40.8	42.1
Other	12.3	23.6	27.7	46.6
Total Revenues	731.6	816.1	1,509	1,534.70
Expenses	'	'	'	'
Compensation and benefits	139.7	128.9	275.2	258.3
Communications	8.3	8.6	16.5	17.5
Technology support services	14.6	13.8	28.5	26.2
Professional fees and outside services	37.5	27.9	67.1	49.8
Amortization of purchased intangibles	25.2	25.9	50.4	51.8
Depreciation and amortization	34.3	33.2	68.4	65.8
Occupancy and building operations	23.2	19	46.4	37.5
Licensing and other fee agreements	25.7	26.9	54.7	48.1
Other	11.1	24.1	35.3	66.4
Total Expenses	319.6	308.3	642.5	621.4
Operating Income	412	507.8	866.5	913.3
Non-Operating Income (Expense)	'	'	'	'
Investment income	15.1	18.7	18.3	22.3
Interest and other borrowing costs	-28.3	-39.2	-62	-78.2
Equity in net losses of unconsolidated subsidiaries	21.5	20.2	43.9	37.7
Other non-operating income (expense)	1.8	0	1.8	0
Total Non-Operating	10.1	-0.3	2	-18.2
Income before Income Taxes	422.1	507.5	868.5	895.1
Income tax provision	158.3	196.2	338.1	346.4
Net Income	263.8	311.3	530.4	548.7
Net Income (Loss) Attributable to Noncontrolling Interest	0	0.1	-0.2	1.7
Net Income Attributable to CME Group	$263.80	$311.20	$530.60	$547
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,480	1,627	1,480	1,647
Earnings per Common Share Attributable to CME Group:	'	'	'	'
Basic (in dollars per share)	$0.79	$0.94	$1.59	$1.65
Diluted (in dollars per share)	$0.79	$0.93	$1.58	$1.64
Weighted Average Number of Common Shares:	'	'	'	'
Basic (in shares)	334,097	332,341	334,002	332,148
Diluted (in shares)	335,800	334,073	335,705	333,739

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$263.80	$311.30	$530.40	$548.70
Other comprehensive income, net of tax	'	'	'	'
Net unrealized holding gains arising during the period	31	-118	55.9	-120.9
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	-1.5	4.7	1.5	-5.9
Investment securities, net	29.5	-113.3	54.4	-115
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0	0	3.2	-1
Amortization of net actuarial (gains) losses included in pension expense	0.1	0.8	0.2	1.6
Defined benefit plans, income tax benefit (expense)	-0.1	-0.2	1.1	-0.9
Defined benefit plans, net	0	0.6	1.9	-1.7
Net unrealized holding losses arising during the period	0	60.3	0	85.3
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	-0.4	0.7	-0.7	1.4
Derivative instruments, income tax benefit (expense)	0.2	-22.2	-0.3	31.6
Derivative instruments, net	-0.2	38.8	-0.4	55.1
Foreign currency translation adjustment	1.8	-4.6	4.2	3.2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	-0.7	1.7	1.6	1.1
Foreign currency translation, net	1.1	-2.9	2.6	2.1
Other Comprehensive Income (Loss), Net of Tax	30.4	-76.8	'	-56.1
Comprehensive income	294.2	234.5	585.1	492.6
Less: comprehensive income attributable to redeemable non-controlling interest	0	0.1	-0.2	1.7
Comprehensive income attributable to CME Group	$294.20	$234.40	$585.30	$490.90

Consolidated_Statements_Of_Sha

Consolidated Statements Of Shareholders' Equity (USD $)	Total	Common Stock And Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]	Class A Common Stock [Member]	Class A Common Stock [Member]	Class B Common Stock [Member]	Class B Common Stock [Member]
In Millions, except Share data in Thousands	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	Class A Common Stock [Member]	Common Stock And Additional Paid-In Capital [Member]	Class B Common Stock [Member]	Common Stock And Additional Paid-In Capital [Member]
Balance at Dec. 31, 2012	'	$17,216.40	$3,993.40	$209.30	$21,419.10	'	'	'	'	'
Balance (in shares) at Dec. 31, 2012	'	'	'	'	'	'	'	331,832	'	3
Other Comprehensive Income (Loss), Net of Tax	-56.1	'	'	-56.1	'	'	'	'	'	'
Stock Issued During Period, Shares, Employee Stock Purchase Plans	'	'	'	'	'	'	'	9	'	'
Stock Issued During Period, Value, Employee Stock Purchase Plan	0.7	0.7	'	'	0.7	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	21,854.60	'	'	'	'	6	'	'	'	'
Net Income Attributable to CME Group	547	'	547	'	547	'	'	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	1.7	'	'	'	'	0.2	'	'	'	'
Net income	547.2	'	'	'	'	'	'	'	'	'
Other comprehensive income attributable to CME Group	-56.1	'	'	-56.1	-56.1	'	'	'	'	'
Dividends on common stock per share	-301.2	'	-301.2	'	-301.2	'	'	'	'	'
Exercise of stock options (in shares)	'	'	'	'	'	'	'	691	'	'
Exercise of stock options	28.1	28.1	'	'	28.1	'	'	'	'	'
Excess tax benefits from option exercises and restricted stock vesting	2.1	2.1	'	'	2.1	'	'	'	'	'
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	'	'	'	'	'	'	'	42	'	'
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	-1.5	-1.5	'	'	-1.5	'	'	'	'	'
Stock Granted, Value, Share-based Compensation, Gross	26	26	'	'	26	'	'	'	'	'
Adjustments to Additional Paid in Capital, Other	182.3	182.3	'	'	'	'	'	'	'	'
Stock Issued To Related Parties During Period Shares	'	'	'	'	'	'	'	27	'	'
Stock Issued To Related Parties During Period Value	2.1	2.1	'	'	2.1	'	'	'	'	'
Balance at Jun. 30, 2013	'	17,456.20	4,239.20	153.2	21,848.60	'	'	'	'	'
Balance (in shares) at Jun. 30, 2013	'	'	'	'	'	'	'	332,601	'	3
Balance at Dec. 31, 2013	21,154.80	17,508.20	3,494.60	152	21,154.80	'	'	'	'	'
Balance (in shares) at Dec. 31, 2013	'	'	'	'	'	'	333,852	333,852	3	3
Other Comprehensive Income (Loss), Net of Tax	'	'	'	54.7	'	'	'	'	'	'
Stock Issued During Period, Shares, Employee Stock Purchase Plans	'	'	'	'	'	'	'	13	'	'
Stock Issued During Period, Value, Employee Stock Purchase Plan	0.9	0.9	'	'	0.9	'	'	'	'	'
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	21,465.40	'	'	'	'	0	'	'	'	'
Net Income Attributable to CME Group	530.6	'	530.6	'	530.6	'	'	'	'	'
Net Income (Loss) Attributable to Noncontrolling Interest	-0.2	'	'	'	'	-0.2	'	'	'	'
Other comprehensive income attributable to CME Group	54.7	'	'	'	54.7	'	'	'	'	'
Purchase of Noncontrolling interest, cost basis	5.5	'	'	'	'	5.5	'	'	'	'
Dividends on common stock per share	-315.4	'	-315.4	'	-315.4	'	'	'	'	'
Exercise of stock options (in shares)	'	'	'	'	'	'	'	298	'	'
Exercise of stock options	11.5	11.5	'	'	11.5	'	'	'	'	'
Excess tax benefits from option exercises and restricted stock vesting	2.9	2.9	'	'	2.9	'	'	'	'	'
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	'	'	'	'	'	'	'	64	'	'
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	-2.7	-2.7	'	'	-2.7	'	'	'	'	'
Stock Granted, Value, Share-based Compensation, Gross	26.4	26.4	'	'	26.4	'	'	'	'	'
Stock Issued To Related Parties During Period Shares	'	'	'	'	'	'	'	24	'	'
Stock Issued To Related Parties During Period Value	1.7	1.7	'	'	1.7	'	'	'	'	'
Balance at Jun. 30, 2014	$21,465.40	$17,548.90	$3,709.80	$206.70	$21,465.40	'	'	'	'	'
Balance (in shares) at Jun. 30, 2014	'	'	'	'	'	'	334,251	334,251	3	3

Consolidated_Statements_Of_Sha1

Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'
Cash dividends on common stock, per share (in dollars per share)	$0.94	$0.90

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities	'	'
Net income	$530.40	$548.70
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Stock-based compensation	26.4	26
Amortization of purchased intangibles	50.4	51.8
Depreciation and amortization	68.4	65.8
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	19.2	3.3
Deferred income taxes	17.5	-10.8
Change in:	'	'
Accounts receivable	-31.9	-92.1
Other current assets	-4	28.6
Other assets	3.8	10.2
Accounts payable	-4.1	-4.7
Income taxes payable	-27.5	35.7
Other current liabilities	-55.2	108.2
Other liabilities	-0.9	0.1
Other	0.6	4.6
Net Cash Provided by Operating Activities	554.7	768.8
Cash Flows from Investing Activities	'	'
Proceeds from maturities of available-for-sale marketable securities	18.3	17.5
Purchases of available-for-sale marketable securities	-19.1	-18.3
Purchases of property	-77.4	-55.8
Proceeds from sale of building property	7.9	0
Net Cash Used in Investing Activities	-70.3	-56.6
Cash Flows from Financing Activities	'	'
Repayment of other borrowings	-750	0
Cash dividends	-1,182.10	-299.8
Proceeds from exercise of stock options	11.5	28.1
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	0	-80
Excess tax benefits related to employee option exercises and restricted stock vesting	2.9	2.1
Other	0.9	0.7
Net Cash Used in Financing Activities	-1,916.80	-348.9
Net change in cash and cash equivalents	-1,432.40	363.3
Cash and cash equivalents, beginning of period	2,469.70	1,604.70
Cash and Cash Equivalents, End of Period	1,037.30	1,968
Supplemental Disclosure of Cash Flow Information	'	'
Income taxes paid	322	312.1
Interest paid	66.8	66.9
Non-cash investing activities:	'	'
Accrued purchase of non-controlling interest	$4.70	$0

Basis_Of_Presentation

Basis Of Presentation	6 Months Ended
Basis Of Presentation	Jun. 30, 2014
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), and their respective subsidiaries (collectively, the exchange). The consolidated statements also include CME Clearing Europe Limited (CMECE) and CME Europe Limited.
	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 June 30, 2014 and December 31, 2013 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, 2013, filed with the Securities and Exchange Commission (SEC) on February 28, 2014.

Performance_Bonds_and_Guaranty

Performance Bonds and Guaranty Fund Contributions (Notes)	6 Months Ended
Performance Bonds and Guaranty Fund Contributions (Notes)	Jun. 30, 2014
Performance Bonds and Guaranty Fund Contributions [Abstract]	'
Performance Bonds and Guaranty Fund Contributions [Text Block]	'
	Performance Bonds and Guaranty Fund Contributions
	Performance Bonds and Guaranty Fund Contributions. At June 30, 2014, performance bonds and guaranty fund contributions in the consolidated balance sheet included performance bond and guaranty fund contributions received in the form of cash, some of which were reinvested by CME in U.S. Treasury securities with maturity dates of 60 days or less. Any interest earned on these U.S. Treasury investments accrues to CME and is included in the consolidated statements of income. Because CME has control of the cash collateral reinvested in U.S. Treasury securities and the benefits and risks of ownership accrue to CME, these performance bonds and guaranty fund contributions are reflected in the consolidated balance sheets. The amortized cost and fair value of the U.S. Treasury securities were both $3.5 billion as of June 30, 2014. The U.S. Treasury securities matured in July 2014.
	Clearing House Contract Settlement. CME and CMECE mark-to-market open positions for all products at least once a day (twice a day for futures and options contracts). Based on values derived from the mark-to-market process, CME and CMECE require payment 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 over-the-counter 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 over-the-counter credit default swap and interest rate swap contracts, the maximum exposure related to CME's guarantee would be one full day of changes in fair value of all open positions, before considering CME's ability to access defaulting clearing firms' collateral. During the first six months of 2014, the clearing houses transferred an average of approximately $2.6 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. The clearing houses reduce the guarantee exposure through initial and maintenance performance bond requirements and mandatory guaranty fund contributions. The company believes that the guarantee liability is immaterial and therefore has not recorded any liability at June 30, 2014.

Intangible_Assets_And_Goodwill

Intangible Assets And Goodwill	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets And Goodwill	'
	Intangible Assets
	Intangible assets consisted of the following at June 30, 2014 and December 31, 2013:



			June 30, 2014							December 31, 2013
	(in millions)		Assigned Value		Accumulated			Net Book		Assigned Value		Accumulated			Net Book
					Amortization			Value				Amortization			Value
	Amortizable Intangible Assets:
	Clearing firm, market data and other customer relationships		$	2,838.80	$	(611.0	)	$	2,227.80	$	2,838.80	$	(563.2	)	$	2,275.60

	Lease-related intangibles		2.2		(0.6		)	1.6		2.2		(0.6		)	1.6

	Technology-related intellectual property		33.8		(22.3		)	11.5		33.8		(19.8		)	14

	Trade name		0.2		(0.2		)	—		0.2		(0.2		)	—

	Total amortizable intangible assets		$	2,875.00	$	(634.1	)	2,240.90		$	2,875.00	$	(583.8	)	2,291.20


	Indefinite-Lived Intangible Assets:
	Trade names							450							450

	Total intangible assets – other, net							$	2,690.90						$	2,741.20

	Trading products(1)							$	17,175.30						$	17,175.30


	-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 revenues are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the CFTC. Product authorizations from the CFTC have no term limits.
	Total amortization expense for intangible assets was $25.2 million and $25.9 million for the quarters ended June 30, 2014 and 2013, respectively. Total amortization expense for intangible assets was $50.4 million and $51.8 million for the six months ended June 30, 2014 and 2013, respectively. As of June 30, 2014, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:


	(in millions)	Amortization Expense
	Remainder of 2014	$	50.4

	2015	100.6

	2016	97.2

	2017	96.4

	2018	94.7

	2019	94.7

	Thereafter	1,706.90

Debt

Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	Short-term debt consisted of the following at June 30, 2014 and December 31, 2013:


	(in millions)		June 30, 2014		December 31, 2013
	$750.0 million fixed rate notes due February 2014, stated rate of 5.75%		$	—	$	749.9

	Total short-term debt		$	—	$	749.9

	Long-term debt consisted of the following at June 30, 2014 and December 31, 2013:


	(in millions)		June 30, 2014		December 31, 2013
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%(1)		$	610.7	$	610.5

	$750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2)		748.1		748

	$750.0 million fixed rates notes due September 2043, stated rate of 5.30% (3)		748.7		748.7

	Total long-term debt		$	2,107.50	$	2,107.20


	-1	In February 2010, CME Group 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 4.46%.

	-2	In August 2012, CME Group 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%.

	-3	In August 2012, CME Group 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 as of June 30, 2014:


	(in millions)	Par Value
	2015	$	—

	2016	—

	2017	—

	2018	612.5

	2019	—

	Thereafter	1,500.00

	The fair value of the fixed rate notes due 2018, which is considered a level 3 liability under the classification hierarchy for fair value measurements, was derived using a standard valuation model with market-based observable inputs including U.S. Treasury yields and interest rate spreads. The fair values of the fixed rate notes due 2022 and 2043 were estimated using quoted market prices and are considered level 2 liabilities. For further information on the three-level classification hierarchy of fair value measurements, see note 8. At June 30, 2014, the fair values of the fixed rate notes by maturity date were as follows:


	(in millions)	Fair Value
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%	$	660.9

	$750.0 million fixed rate notes due September 2022, stated rate of 3.00%	742.6

	$750.0 million fixed rates notes due September 2043, stated rate of 5.30%	862.9

Contingencies

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2014
Loss Contingency [Abstract]	'
Contingencies	'
	Contingencies
	Legal and Regulatory Matters. In 2008, Fifth Market, Inc. (Fifth Market) filed a complaint against CME Group and CME in the Delaware District Court seeking a permanent injunction against CME's Globex system and unquantified enhanced damages for what the plaintiff alleges is willful infringement of two patents, in addition to costs, expenses and attorneys' fees. The case was stayed pending the outcome of CME's request for reexamination by the U.S. Patent and Trademark Office (USPTO). The reexaminations resulted in some claims being rejected and others being confirmed. In June 2013, the court lifted the stay. The validity of the patents, however, remains subject to further review by the USPTO. Based on its investigation to date and advice from legal counsel, the company believes this suit is without merit and intends to defend itself vigorously against these charges.
	In 2009, CME and CBOT filed a complaint against Howard Garber in the Northern District of Illinois seeking a declaratory judgment that neither CME nor CBOT infringed the Garber patent, which relates to electronic market makers, and that the patent is invalid and unenforceable. The Technology Research Group (TRG) was substituted for Mr. Garber in 2009 and TRG filed counterclaims alleging patent infringement and other related claims. In 2011, the case was dismissed with the right to reinstate pending the outcome of a reexamination by the USPTO. In August and October 2013, the USPTO issued actions resulting in the rejection of all TRG’s claims completing the reexamination process. In January 2014, TRG appealed the decision of the USPTO. Based on its investigation to date and advice from legal counsel, the company believes this suit is without merit and intends to defend itself vigorously against these charges.
	The foregoing legal matters involve alleged infringements of intellectual property which, due to their nature, involve potential liability that is uncertain, difficult to quantify and involves a wide range of potential outcomes. The company believes that the matters are without merit, and the company intends to defend itself vigorously against the claims. We expect the re-examinations by the USPTO in the Fifth Market and Garber matters, including any appeals thereof, to result in a determination of the validity of the patents at issue which we expect will have an impact on the merits of the matters. Given the uncertainty of factors which may potentially impact the resolution of these matters, at this time the company is unable to estimate the reasonably possible loss or range of reasonably possible loss in the unlikely event it were found to be liable at trial in these matters.
	A number of lawsuits were filed in federal court in New York on behalf of all commodity account holders or customers of MF Global who had not received a return of 100% of their funds. These matters have been consolidated into a single action in federal court in New York, and a consolidated amended class action complaint was filed on November 5, 2012. On November 6, 2013, CME announced that it has reached an agreement in principle to resolve the class action litigation. In an agreement between the trustee and CME, CME will be allowed to assert a $29.0 million claim against MF Global based on expenses incurred by CME as a result of MF Global’s bankruptcy. In a separate agreement between CME and the customer representatives, CME has agreed to deliver $14.5 million, one-half of the distribution that it will receive from the trustee, to the customer representatives for distribution to MF Global’s former customers. In connection with the settlements between the company and the trustee and the customers, the company’s $550.0 million financial guarantee to the bankruptcy trustee to cover any shortfall in the bankruptcy has been extinguished.
	In February 2013, the CFTC filed suit against NYMEX and two former employees alleging disclosure of confidential customer information in violation of the Commodity Exchange Act. Based on the initial review of the complaint, the company believes that it has strong factual and legal defenses to the claim.
	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 basis will not have a material impact on its consolidated financial position or results of operations.
	At June 30, 2014 and December 31, 2013, the company had accrued $4.3 million and $11.3 million, respectively, for legal and regulatory matters that were probable and estimable.
	Intellectual Property Indemnifications. Certain agreements with customers and other third parties related to accessing the CME 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	6 Months Ended
Guarantees	Jun. 30, 2014
Guarantees [Abstract]	'
Guarantees	'
	Guarantees
	Mutual Offset Agreement. CME and Singapore Exchange Limited (SGX) have a mutual offset agreement with a current term through October 2014. 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 can maintain collateral in the form of U.S. Treasury securities or irrevocable, standby letters of credit. At June 30, 2014, CME was contingently liable to SGX on letters of credit totaling $460.0 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 June 30, 2014.
	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 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 payment amount of $100.0 million. Since its establishment, the Fund has made payments of approximately $2.0 million, which leaves $98.0 million available for future claims. If payments to participants were to exceed the amount remaining in the fund at the time of insolvency, payments would be pro-rated. Clearing members and customers must register in advance with the company 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 June 30, 2014.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Notes)	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	Accumulated Other Comprehensive Income
	The following tables present changes in the accumulated balances for each component of other comprehensive income attributable to CME Group, including current period other comprehensive income and reclassifications out of accumulated other comprehensive income:


	(in millions)	Investment Securities			Defined Benefit Plans			Derivative Investments			Foreign Currency Translation			Total
	Balance at December 31, 2013	$	98.9		$	(12.8	)	$	65		$	0.9		$	152

	Other comprehensive income before reclassifications and income tax benefit (expense)	55.9			(3.2		)	—			4.2			56.9

	Amounts reclassified from accumulated other comprehensive income	—			0.2			(0.7		)	—			(0.5		)

	Income tax benefit (expense)	(1.5		)	1.1			0.3			(1.6		)	(1.7		)

	Net current period other comprehensive income attributable to CME Group	54.4			(1.9		)	(0.4		)	2.6			54.7

	Balance at June 30, 2014	$	153.3		$	(14.7	)	$	64.6		$	3.5		$	206.7



	(in millions)	Investment Securities			Defined Benefit Plans			Derivative Investments			Foreign Currency Translation			Total
	Balance at December 31, 2012	$	256.7		$	(32.4	)	$	(16.4	)	$	1.4		$	209.3

	Other comprehensive income before reclassifications and income tax benefit (expense)	(120.9		)	1			85.3			3.2			(31.4		)

	Amounts reclassified from accumulated other comprehensive income	—			1.6			1.4			—			3

	Income tax benefit (expense)	5.9			(0.9		)	(31.6		)	(1.1		)	(27.7		)

	Net current period other comprehensive income attributable to CME Group	(115.0		)	1.7			55.1			2.1			(56.1		)

	Balance at June 30, 2013	$	141.7		$	(30.7	)	$	38.7		$	3.5		$	153.2

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
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 U.S. Treasury securities and investments in publicly traded stocks and mutual funds 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.
	The company determined the fair value of its contingent consideration liabilities, considered level 3 liabilities, using a discounted cash flow model to calculate the present value of future payouts. The liabilities were included in level 3 because management used significant unobservable inputs, including a discount rate of 20% and payout probabilities of either 75% or 100%. Significant increases or decreases in any of those inputs in isolation would result in a significantly different fair value.
	Financial assets and liabilities recorded in the consolidated balance sheet as of June 30, 2014 were classified in their entirety based on the lowest level of input that was significant to each asset or liability's fair value measurement. The following presents financial instruments measured at fair value on a recurring basis:


			June 30, 2014
	(in millions)		Level 1		Level 2		Level 3		Total
	Assets at Fair Value:
	Marketable securities:
	U.S. Treasury securities		$	19.2	$	—	$	—	$	19.2

	Mutual funds		53.3		—		—		53.3

	Asset-backed securities		—		0.4		—		0.4

	Total Marketable Securities		72.5		0.4		—		72.9

	Performance bonds and guaranty fund contributions:
	U.S. Treasury securities (1)		3,500.00		—		—		3,500.00

	Equity investments		555.8		—		—		555.8

	Total Assets at Fair Value		$	4,128.30	$	0.4	$	—	$	4,128.70


	Liabilities at Fair Value:
	Contingent consideration		$	—	$	—	$	24	$	24

	Total Liabilities at Fair Value		$	—	$	—	$	24	$	24

	(1) Performance bonds and guaranty fund contributions on the consolidated balance sheet as of June 30, 2014 include cash contributions reinvested in U.S. Treasury securities.
	There were no transfers of assets or liabilities between level 1, level 2 or level 3 during the first six months of 2014. The following is a reconciliation of liabilities valued at fair value on a recurring basis using significant unobservable inputs (level 3) during the first six months of 2014. There were no assets valued at fair value on a recurring basis using significant unobservable inputs (level 3) during the first six months of 2014.


	(in millions)	Contingent Consideration
	Fair value of liability at December 31, 2013	$	15.7

	Realized and unrealized (gains) losses:
	Included in other expenses	8.3

	Fair value of liability at June 30, 2014	$	24

	There were no assets or liabilities valued at fair value on a nonrecurring basis using significant unobservable inputs (level 3) during the first six months of 2014.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
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 and restricted stock awards were as follows for the periods presented:


		Quarter Ended					Six Months Ended
		June 30,					June 30,
	(in thousands)	2014			2013		2014	2013
	Stock options	1,480			1,627		1,480	1,647

	Stock awards	—			—		—	—

	Total	1,480			1,627		1,480	1,647

	The following table presents the earnings per share calculation for the periods presented:


			Quarter Ended					Six Months Ended
			June 30,					June 30,
			2014			2013		2014		2013
	Net Income Attributable to CME Group (in millions)		$	263.8		$	311.2	$	530.6	$	547

	Weighted Average Number of Common Shares (in thousands):
	Basic		334,097			332,341		334,002		332,148

	Effect of stock options and restricted stock awards		1,703			1,732		1,703		1,591

	Diluted		335,800			334,073		335,705		333,739

	Earnings per Common Share Attributable to CME Group:
	Basic		$	0.79		$	0.94	$	1.59	$	1.65

	Diluted		0.79			0.93		1.58		1.64

Subsequent_Events

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	The company has evaluated subsequent events through the date the financial statements were issued and has determined that there are no subsequent events that require disclosure except for the following:
	On July 30, 2014, CME Group agreed to acquire Trayport, which provides trading software to the European energy markets, and FENICS, a business solutions provider for global over-the-counter foreign currency options markets, from GFI Group Inc. The acquisition, which supports the company’s continuing expansion in Europe, will be completed through a merger of GFI and CME Group concurrent with the sale of GFI’s brokerage business to a third party. GFI shareholders will receive CME Group Class A common stock currently valued at approximately $580.0 million. CME Group will receive $165.0 million in cash for the sale of the brokerage business. In conjunction with these transactions, CME Group will assume $240.0 million in outstanding debt that the company expects to retire in 2015. The merger is expected to close in early 2015 subject to regulatory approvals and customary closing conditions.

Intangible_Assets_And_Goodwill1

Intangible Assets And Goodwill (Tables)	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Components of intangible assets	'
	Intangible assets consisted of the following at June 30, 2014 and December 31, 2013:



			June 30, 2014							December 31, 2013
	(in millions)		Assigned Value		Accumulated			Net Book		Assigned Value		Accumulated			Net Book
					Amortization			Value				Amortization			Value
	Amortizable Intangible Assets:
	Clearing firm, market data and other customer relationships		$	2,838.80	$	(611.0	)	$	2,227.80	$	2,838.80	$	(563.2	)	$	2,275.60

	Lease-related intangibles		2.2		(0.6		)	1.6		2.2		(0.6		)	1.6

	Technology-related intellectual property		33.8		(22.3		)	11.5		33.8		(19.8		)	14

	Trade name		0.2		(0.2		)	—		0.2		(0.2		)	—

	Total amortizable intangible assets		$	2,875.00	$	(634.1	)	2,240.90		$	2,875.00	$	(583.8	)	2,291.20


	Indefinite-Lived Intangible Assets:
	Trade names							450							450

	Total intangible assets – other, net							$	2,690.90						$	2,741.20

	Trading products(1)							$	17,175.30						$	17,175.30


	-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 revenues are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the CFTC. Product authorizations from the CFTC have no term limits.
Future estimated amortization expense	'
	As of June 30, 2014, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:


	(in millions)	Amortization Expense
	Remainder of 2014	$	50.4

	2015	100.6

	2016	97.2

	2017	96.4

	2018	94.7

	2019	94.7

	Thereafter	1,706.90

Debt_Tables

Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Short-term Debt [Table Text Block]	'
	Short-term debt consisted of the following at June 30, 2014 and December 31, 2013:


	(in millions)		June 30, 2014		December 31, 2013
	$750.0 million fixed rate notes due February 2014, stated rate of 5.75%		$	—	$	749.9

	Total short-term debt		$	—	$	749.9

Schedule Of Short-Term And Long-Term Debt	'
	Long-term debt consisted of the following at June 30, 2014 and December 31, 2013:


	(in millions)		June 30, 2014		December 31, 2013
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%(1)		$	610.7	$	610.5

	$750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2)		748.1		748

	$750.0 million fixed rates notes due September 2043, stated rate of 5.30% (3)		748.7		748.7

	Total long-term debt		$	2,107.50	$	2,107.20


	-1	In February 2010, CME Group 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 4.46%.

	-2	In August 2012, CME Group 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%.

	-3	In August 2012, CME Group 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 as of June 30, 2014:


	(in millions)	Par Value
	2015	$	—

	2016	—

	2017	—

	2018	612.5

	2019	—

	Thereafter	1,500.00

Fair value of fixed rate notes by maturity date	'
	At June 30, 2014, the fair values of the fixed rate notes by maturity date were as follows:


	(in millions)	Fair Value
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%	$	660.9

	$750.0 million fixed rate notes due September 2022, stated rate of 3.00%	742.6

	$750.0 million fixed rates notes due September 2043, stated rate of 5.30%	862.9

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following tables present changes in the accumulated balances for each component of other comprehensive income attributable to CME Group, including current period other comprehensive income and reclassifications out of accumulated other comprehensive income:


	(in millions)	Investment Securities			Defined Benefit Plans			Derivative Investments			Foreign Currency Translation			Total
	Balance at December 31, 2013	$	98.9		$	(12.8	)	$	65		$	0.9		$	152

	Other comprehensive income before reclassifications and income tax benefit (expense)	55.9			(3.2		)	—			4.2			56.9

	Amounts reclassified from accumulated other comprehensive income	—			0.2			(0.7		)	—			(0.5		)

	Income tax benefit (expense)	(1.5		)	1.1			0.3			(1.6		)	(1.7		)

	Net current period other comprehensive income attributable to CME Group	54.4			(1.9		)	(0.4		)	2.6			54.7

	Balance at June 30, 2014	$	153.3		$	(14.7	)	$	64.6		$	3.5		$	206.7



	(in millions)	Investment Securities			Defined Benefit Plans			Derivative Investments			Foreign Currency Translation			Total
	Balance at December 31, 2012	$	256.7		$	(32.4	)	$	(16.4	)	$	1.4		$	209.3

	Other comprehensive income before reclassifications and income tax benefit (expense)	(120.9		)	1			85.3			3.2			(31.4		)

	Amounts reclassified from accumulated other comprehensive income	—			1.6			1.4			—			3

	Income tax benefit (expense)	5.9			(0.9		)	(31.6		)	(1.1		)	(27.7		)

	Net current period other comprehensive income attributable to CME Group	(115.0		)	1.7			55.1			2.1			(56.1		)

	Balance at June 30, 2013	$	141.7		$	(30.7	)	$	38.7		$	3.5		$	153.2

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]	'
Financial instruments measured at fair value on a recurring basis	'
	The following presents financial instruments measured at fair value on a recurring basis:


			June 30, 2014
	(in millions)		Level 1		Level 2		Level 3		Total
	Assets at Fair Value:
	Marketable securities:
	U.S. Treasury securities		$	19.2	$	—	$	—	$	19.2

	Mutual funds		53.3		—		—		53.3

	Asset-backed securities		—		0.4		—		0.4

	Total Marketable Securities		72.5		0.4		—		72.9

	Performance bonds and guaranty fund contributions:
	U.S. Treasury securities (1)		3,500.00		—		—		3,500.00

	Equity investments		555.8		—		—		555.8

	Total Assets at Fair Value		$	4,128.30	$	0.4	$	—	$	4,128.70


	Liabilities at Fair Value:
	Contingent consideration		$	—	$	—	$	24	$	24

	Total Liabilities at Fair Value		$	—	$	—	$	24	$	24

Reconciliation of assets and liabilities valued at fair value on a recurring basis using significant unobservable inputs (level 3)	'
	The following is a reconciliation of liabilities valued at fair value on a recurring basis using significant unobservable inputs (level 3) during the first six months of 2014. There were no assets valued at fair value on a recurring basis using significant unobservable inputs (level 3) during the first six months of 2014.


	(in millions)	Contingent Consideration
	Fair value of liability at December 31, 2013	$	15.7

	Realized and unrealized (gains) losses:
	Included in other expenses	8.3

	Fair value of liability at June 30, 2014	$	24

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	'
	Anti-dilutive stock options and restricted stock awards were as follows for the periods presented:


		Quarter Ended					Six Months Ended
		June 30,					June 30,
	(in thousands)	2014			2013		2014	2013
	Stock options	1,480			1,627		1,480	1,647

	Stock awards	—			—		—	—

	Total	1,480			1,627		1,480	1,647

Basic And Diluted Earnings Per Share	'
	The following table presents the earnings per share calculation for the periods presented:


			Quarter Ended					Six Months Ended
			June 30,					June 30,
			2014			2013		2014		2013
	Net Income Attributable to CME Group (in millions)		$	263.8		$	311.2	$	530.6	$	547

	Weighted Average Number of Common Shares (in thousands):
	Basic		334,097			332,341		334,002		332,148

	Effect of stock options and restricted stock awards		1,703			1,732		1,703		1,591

	Diluted		335,800			334,073		335,705		333,739

	Earnings per Common Share Attributable to CME Group:
	Basic		$	0.79		$	0.94	$	1.59	$	1.65

	Diluted		0.79			0.93		1.58		1.64

Performance_Bonds_and_Guaranty1

Performance Bonds and Guaranty Fund Contributions (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	$1,037,300,000	$2,469,700,000	$1,968,000,000	$1,604,700,000
Average Daily Clearing Settlement	2,600,000,000	'	'	'
US Treasury Securities [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	3,500,000,000	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	$3,500,000,000	'	'	'

Intangible_Assets_And_Goodwill2

Intangible Assets And Goodwill (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization of purchased intangibles	$25.20	$25.90	$50.40	$51.80

Intangible_Assets_And_Goodwill3

Intangible Assets And Goodwill (Components Of Intangible Assets) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'		'
Indefinite-lived Intangible Assets	$2,690.90		$2,741.20
Other Indefinite-lived Intangible Assets	17,175.30	[1]	17,175.30	[1]
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	2,838.80		2,838.80
Accumulated amortization	-611		-563.2
Net book value	2,227.80		2,275.60
Lease-Related Intangibles [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Finite-Lived Intangible Assets, Gross	2.2		2.2
Accumulated amortization	-0.6		-0.6
Net book value	1.6		1.6
Technology-Related Intellectual Property [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Finite-Lived Intangible Assets, Gross	33.8		33.8
Accumulated amortization	-22.3		-19.8
Net book value	11.5		14
Trade Names [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Finite-Lived Intangible Assets, Gross	0.2		0.2
Accumulated amortization	-0.2		-0.2
Net book value	0		0
Total Amortizable Intangible Assets [Member]	'		'
Finite-Lived Intangible Assets [Line Items]	'		'
Finite-Lived Intangible Assets, Gross	2,875		2,875
Accumulated amortization	-634.1		-583.8
Net book value	$2,240.90		$2,291.20

[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 revenues are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the CFTC. Product authorizations from the CFTC have no term limits.

Intangible_Assets_And_Goodwill4

Intangible Assets And Goodwill (Future Estimated Amortization Expense) (Details) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Remainder of 2014	$50.40
2015	100.6
2016	97.2
2017	96.4
2018	94.7
2019	94.7
Thereafter	$1,706.90

Debt_Schedule_Of_ShortTerm_And

Debt (Schedule Of Short-Term And Long-Term Debt) (Details) (USD $)

1 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Feb. 28, 2010

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

$750.0 million fixed rate notes due February 2014, interest equal to 5.75% [Member]

$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]

$750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]

$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]

Debt Instrument [Line Items]

Short-term debt

$749.90

Long-term debt

2,107.50

2,107.20

610.7

610.5

748.1

748

748.7

Forward starting interest rate swap agreement fixed rate

4.73%

3.32%

4.46%

Debt Instrument, Face Amount

$750

$612.50

$750

Debt instrument, maturity date

1-Feb-14

1-Mar-18

1-Sep-22

1-Sep-43

Debt Instrument, Interest Rate, Stated Percentage

5.75%

4.40%

3.00%

5.30%

Debt_Schedule_Of_Maturities_Of

Debt (Schedule Of Maturities Of Long-Term Debt) (Details) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified	Jun. 30, 2014
Debt Disclosure [Abstract]	'
2015	$0
2016	0
2017	0
2018	612.5
2019	0
Thereafter	$1,500

Debt_Fair_Value_Of_Fixed_Rate_

Debt (Fair Value Of Fixed Rate Notes) (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
$750.0 million fixed rate notes due February 2014, interest equal to 5.75% [Member]	'
Debt Instrument [Line Items]	'
Debt Instrument, Face Amount	$750
Debt instrument, maturity date	1-Feb-14
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]	'
Debt Instrument [Line Items]	'
Debt instrument, fair value	660.9
Debt Instrument, Face Amount	612.5
Debt instrument, maturity date	1-Mar-18
$750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]	'
Debt Instrument [Line Items]	'
Debt instrument, fair value	742.6
Debt Instrument, Face Amount	750
Debt instrument, maturity date	1-Sep-22
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]	'
Debt Instrument [Line Items]	'
Debt instrument, fair value	862.9
Debt Instrument, Face Amount	$750
Debt instrument, maturity date	1-Sep-43

Debt_Debt_ShortTerm_Debt_Detai

Debt Debt (Short-Term Debt) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]	'	'
Short-term debt	$0	$749.90
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]	'	'
Short-term Debt [Line Items]	'	'
Debt Instrument, Face Amount	750	'
Debt Instrument, Interest Rate, Stated Percentage	5.30%	'
$750.0 million fixed rate notes due February 2014, interest equal to 5.75% [Member]	'	'
Short-term Debt [Line Items]	'	'
Debt Instrument, Face Amount	750	'
Debt Instrument, Interest Rate, Stated Percentage	5.75%	'
Short-term debt	$0	$749.90

Contingencies_Details

Contingencies (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Nov. 01, 2013
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	MF Global [Member]	MF Global [Member]
Loss Contingencies [Line Items]	'	'	'	'
Bankruptcy Claims, Amount of Claims Settled	'	'	'	$29
Bankruptcy Settlement Returned to Customers	'	'	'	14.5
Accrued liability related to all outstanding legal matters	4.3	11.3	'	'
Guarantor Obligations, Current Carrying Value	'	'	$550	'

Guarantees_Details

Guarantees (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
	years
Guarantor Obligations [Line Items]	'
Agreement automatic renewal period (in years)	1
Contingent liability to SGX, amount of irrevocable letters of credit	$460,000,000
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_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)

3 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Accumulated Other Comprehensive Income (Loss) [Member]

Accumulated Translation Adjustment [Member]

Investment Securities [Member]

Derivative Financial Instruments, Assets [Member]

Pension Plans, Defined Benefit [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Reclassification adjustment for loss included in net income

Stockholders' Equity Attributable to Parent

21,465.40

21,154.80

206.7

153.2

152

209.3

3.5

0.9

1.4

153.3

141.7

98.9

256.7

64.6

38.7

-16.4

-14.7

-30.7

-12.8

-32.4

Net unrealized holding gains arising during the period

-118

55.9

-120.9

55.9

-120.9

Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax

3.2

-1

-3.2

Net unrealized holding losses arising during the period

60.3

85.3

Foreign currency translation adjustment

1.8

-4.6

4.2

3.2

4.2

3.2

Comprehensive Income Before Reclassification Adjustments

56.9

-31.4

Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax

Amortization of net actuarial (gains) losses included in pension expense

0.1

0.8

0.2

1.6

0.2

1.6

Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax

-0.4

0.7

-0.7

1.4

-0.7

1.4

Comprehensive Income Reclassification Adjustments

-0.5

Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax

-1.5

4.7

1.5

-5.9

-1.5

5.9

Defined benefit plans, income tax benefit (expense)

-0.1

-0.2

1.1

-0.9

1.1

-0.9

Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax

0.3

-31.6

Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax

-0.7

1.7

1.6

1.1

-1.6

-1.1

Comprehensive Income, Tax

-1.7

-27.7

Other Comprehensive Income (Loss), Net of Tax

$30.40

($76.80)

($56.10)

$54.70

($56.10)

$2.60

$2.10

$54.40

($115)

($0.40)

$55.10

($1.90)

$1.70

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Good Faith and Margin Deposits with Broker-Dealers	$20,089.90	$21,355.10
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Marketable Securities	72.9	'
Good Faith and Margin Deposits with Broker-Dealers	3,500	'
Investment Owned, at Fair Value	555.8	'
Total Assets at Fair Value	4,128.70	'
Contingent consideration at Fair Value	24	'
Total liabilities at fair value	24	'
Fair Value, Measurements, Recurring [Member] \| US Treasury Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale Securities at Fair Value	19.2	'
Fair Value, Measurements, Recurring [Member] \| Asset Backed Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale Securities at Fair Value	0.4	'
Fair Value, Measurements, Recurring [Member] \| Exchange Traded Funds [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Trading Securities at Fair Value	53.3	'
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Marketable Securities	72.5	'
Good Faith and Margin Deposits with Broker-Dealers	3,500	'
Investment Owned, at Fair Value	555.8	'
Total Assets at Fair Value	4,128.30	'
Contingent consideration at Fair Value	0	'
Total liabilities at fair value	0	'
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale Securities at Fair Value	19.2	'
Fair Value, Measurements, Recurring [Member] \| 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, Measurements, Recurring [Member] \| 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	53.3	'
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Marketable Securities	0.4	'
Good Faith and Margin Deposits with Broker-Dealers	0	'
Investment Owned, at Fair Value	0	'
Total Assets at Fair Value	0.4	'
Contingent consideration at Fair Value	0	'
Total liabilities at fair value	0	'
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale Securities at Fair Value	0	'
Fair Value, Measurements, Recurring [Member] \| 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	0.4	'
Fair Value, Measurements, Recurring [Member] \| 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, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Marketable Securities	0	'
Good Faith and Margin Deposits with Broker-Dealers	0	'
Investment Owned, at Fair Value	0	'
Total Assets at Fair Value	0	'
Contingent consideration at Fair Value	24	15.7
Total liabilities at fair value	24	'
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Available-for-sale Securities at Fair Value	0	'
Fair Value, Measurements, Recurring [Member] \| 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, Recurring [Member] \| 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_Measurements_Reconc

Fair Value Measurements (Reconciliation Using Significant Unobservable Inputs) (Details) (Fair Value, Measurements, Recurring [Member], USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Contingent consideration at Fair Value	$24	'
Fair Value, Inputs, Level 3 [Member]	'	'
Contingent consideration at Fair Value	24	15.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'
Included in operating expense	$8.30	'

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements Narrative (Detail) (Details)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Valuation model discount rate	20.00%
Valulation Model Probability Low Range	75.00%
Valuation Model Probability High Range	100.00%

Earnings_Per_Share_Net_Income_

Earnings Per Share (Net Income Attributable To CME Group) (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Net Income Attributable to CME Group	$263.80	$311.20	$530.60	$547
Basic (in shares)	334,097	332,341	334,002	332,148
Dilutive Securities, Effect on EPS	1,703	1,732	1,703	1,591
Diluted (in shares)	335,800	334,073	335,705	333,739
Earnings per common share, basic (in dollars per share)	$0.79	$0.94	$1.59	$1.65
Earnings per common share, diluted (in dollars per share)	$0.79	$0.93	$1.58	$1.64
Retained Earnings [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Net Income Attributable to CME Group	'	'	$530.60	$547

Earnings_Per_Share_AntiDilutiv

Earnings Per Share Anti-Dilutive Securities (Details)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,480	1,627	1,480	1,647
Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,480	1,627	1,480	1,647
Restricted Stock [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events (Details) (Business Acquisition Announcement [Member], USD $)	1 Months Ended
In Millions, unless otherwise specified	Jul. 30, 2014
Business Acquisition Announcement [Member]	'
Subsequent Event [Line Items]	'
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	$580
Proceeds from Sale of Other Investments	165
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$240