CME (CME) 10-Q 6 May 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 15, 2015
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2015
Entity Registrant Name	CME GROUP INC.
Entity Central Index Key	1156375
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		337,554,839
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 $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Assets
Cash and cash equivalents	$1,694.80		$1,366.10
Marketable securities	78.8		74.7
Accounts receivable, net of allowance of $0.9 and $1.2	383.4		341.2
Other current assets (includes $32.0 and $37.0 in restricted cash)	154.8		196.5
Cash performance bonds and guaranty fund contributions	45,174.20		40,566.80
Total current assets	47,486		42,545.30
Property, net of accumulated depreciation and amortization of $764.3 and $741.0	503.3		508.9
Intangible assets - trading products	17,175.30	[1]	17,175.30	[1]
Intangible assets - other, net	2,612.50		2,637.40
Goodwill	7,569		7,569
Other assets (includes $70.1 and $72.4 in restricted cash)	1,782.30		1,805.60
Total Assets	77,128.40		72,241.50
Liabilities and Shareholders' Equity
Accounts payable	34		36.9
Other current liabilities	286.9		927.5
Cash performance bonds and guaranty fund contributions	45,174.20		40,566.80
Total current liabilities	45,495.10		41,531.20
Long-term debt	2,851.90		2,107.90
Deferred income tax liabilities, net	7,299.70		7,302.70
Other liabilities	386.2		376.2
Total Liabilities	56,032.90		51,318
Shareholders' Equity:
Preferred stock, $0.01 par value, 10,000 shares authorized, none issued or outstanding	0		0
Additional paid-in capital	17,638.60		17,596.60
Retained earnings	3,479.30		3,317.30
Accumulated other comprehensive income (loss)	-25.8		6.2
Total Shareholders' Equity	21,095.50		20,923.50
Total Liabilities and Shareholders' Equity	77,128.40		72,241.50
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 $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data in Thousands, unless otherwise specified
Accounts receivable, allowance	$0.90	$1.20
Restricted cash, current	32	37
Accumulated depreciation and amortization, property	764.3	741
Restricted cash, noncurrent	$70.10	$72.40
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)	335,928	335,452
Common stock, shares outstanding (in shares)	335,928	335,452
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
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues
Clearing and transaction fees	$708.20	$652.20
Market data and information services	98	89.4
Access and communication fees	21.3	20.4
Other	15.2	15.4
Total Revenues	842.7	777.4
Expenses
Compensation and benefits	141.3	135.5
Communications	7.6	8.2
Technology support services	15.6	13.9
Professional fees and outside services	29.1	29.6
Amortization of purchased intangibles	24.9	25.2
Depreciation and amortization	31.8	34.1
Occupancy and building operations	22.8	23.2
Licensing and other fee agreements	30.6	29
Other	31.7	24.2
Total Expenses	335.4	322.9
Operating Income	507.3	454.5
Non-Operating Income (Expense)
Investment income	5.7	3.2
Gain (Loss) on Derivative Instruments, Net, Pretax	-1.8	0
Interest and other borrowing costs	-31.6	-33.7
Equity in net losses of unconsolidated subsidiaries	22.5	22.4
Other non-operating income (expense)	21.7	0
Total Non-Operating	16.5	-8.1
Income before Income Taxes	523.8	446.4
Income tax provision	193.4	179.8
Net income	330.4	266.6
Net Income (Loss) Attributable to Noncontrolling Interest	0	-0.2
Net Income Attributable to CME Group	$330.40	$266.80
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	538	1,502
Earnings per Common Share Attributable to CME Group:
Basic (in dollars per share)	$0.98	$0.80
Diluted (in dollars per share)	$0.98	$0.79
Weighted Average Number of Common Shares:
Basic (in shares)	335,680	333,905
Diluted (in shares)	337,416	335,644

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$330.40	$266.60
Other comprehensive income, net of tax
Net unrealized holding gains arising during the period	-27.7	24.9
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0
Investment securities, net	-27.7	24.9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	-0.3	-3.2
Amortization of net actuarial (gains) losses included in pension expense	0.7	0.1
Defined benefit plans, income tax benefit (expense)	-0.2	1.2
Defined benefit plans, net	0.2	-1.9
Net unrealized holding losses arising during the period	-4.7	0
Loss on Cash Flow Hedge Ineffectiveness	1.8	0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	-0.3	-0.3
Derivative instruments, income tax benefit (expense)	1.2	0.1
Derivative instruments, net	-2	-0.2
Foreign currency translation adjustment	-4	2.4
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1.5	-0.9
Foreign currency translation, net	-2.5	1.5
Other Comprehensive Income (Loss), Net of Tax	-32	24.3
Comprehensive income	298.4	290.9
Less: comprehensive income attributable to redeemable non-controlling interest	0	-0.2
Comprehensive income attributable to CME Group	$298.40	$291.10

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 ($)		Common Stock And Additional Paid-In Capital [Member]		Common Stock And Additional Paid-In Capital [Member]
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2013						$5.70
Balance at Dec. 31, 2013		17,508.20	3,494.60	152	21,154.80
Balance (in shares) at Dec. 31, 2013								333,852		3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	21,310.10
Net Income Attributable to CME Group	266.8		266.8		266.8
Net Income (Loss) Attributable to Noncontrolling Interest	-0.2					-0.2
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	266.6
Other Comprehensive Income (Loss), Net of Tax	24.3			24.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	24.3			24.3	24.3
Net income	266.6
Dividends on common stock per share	-157.5		-157.5		-157.5
Exercise of stock options (in shares)								101
Exercise of stock options	4.5	4.5			4.5
Excess tax benefits from option exercises and restricted stock vesting	0.9	0.9			0.9
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								54
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	-2.4	-2.4			-2.4
Stock Granted, Value, Share-based Compensation, Gross	13.2	13.2			13.2
Balance at Mar. 31, 2014		17,524.40	3,603.90	176.3	21,304.60
Stockholders' Equity Attributable to Noncontrolling Interest at Mar. 31, 2014						5.5
Balance (in shares) at Mar. 31, 2014								334,007		3
Balance at Dec. 31, 2014	20,923.50	17,600	3,317.30	6.2	20,923.50
Balance (in shares) at Dec. 31, 2014							335,452	335,452	3	3
Net Income Attributable to CME Group	330.4		330.4		330.4
Net Income (Loss) Attributable to Noncontrolling Interest	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	330.4
Other Comprehensive Income (Loss), Net of Tax	-32			-32
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					-32
Dividends on common stock per share			-168.4		-168.4
Exercise of stock options (in shares)								436
Exercise of stock options		28.6			28.6
Excess tax benefits from option exercises and restricted stock vesting		0.7			0.7
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								40
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		-2			-2
Stock Granted, Value, Share-based Compensation, Gross		14.7			14.7
Balance at Mar. 31, 2015	$21,095.50	$17,642	$3,479.30	($25.80)	$21,095.50
Balance (in shares) at Mar. 31, 2015							335,928	335,928	3	3

Consolidated_Statements_Of_Sha1

Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock, per share (in dollars per share)	$0.50	$0.47

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income	$330.40	$266.60
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	14.7	13.2
Amortization of purchased intangibles	24.9	25.2
Depreciation and amortization	31.8	34.1
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	3.3	-11
Deferred income taxes	0.5	25.8
Change in:
Accounts receivable	-41.8	-41.9
Other current assets	4.9	5.9
Other assets	-11.2	16.2
Accounts payable	-3	6.9
Income taxes payable	149.1	132.6
Other current liabilities	-85.4	-95.4
Other liabilities	-1.9	3.6
Other	2.6	1.2
Net Cash Provided by Operating Activities	418.9	383
Cash Flows from Investing Activities
Proceeds from maturities of available-for-sale marketable securities	10.2	9.3
Purchases of available-for-sale marketable securities	-10.2	-10.1
Purchases of property	-31.4	-36.5
Proceeds from sale of building property	0	7.9
Settlement of derivative related to debt issuance	7	0
Net Cash Used in Investing Activities	-24.4	-29.4
Cash Flows from Financing Activities
Proceeds from other borrowings, net of issuance costs	743.7	0
Repayment of other borrowings	0	-750
Cash dividends	-838.8	-1,025
Proceeds from exercise of stock options	28.6	4.5
Excess tax benefits related to employee option exercises and restricted stock vesting	0.7	0.9
Net Cash Used in Financing Activities	-65.8	-1,769.60
Net change in cash and cash equivalents	328.7	-1,416
Cash and cash equivalents, beginning of period	1,366.10	2,469.70
Cash and Cash Equivalents, End of Period	1,694.80	1,053.70
Supplemental Disclosure of Cash Flow Information
Income taxes paid	43.9	15.8
Interest paid	$44.60	$66.80

Basis_Of_Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 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, 2014, filed with the Securities and Exchange Commission (SEC) on February 26, 2015.

Performance_Bonds_and_Guaranty

Performance Bonds and Guaranty Fund Contributions (Notes)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, performance bonds and guaranty fund contribution assets on the consolidated balance sheets include cash and U.S. Treasury securities with maturity dates of 90 days or less. U.S. Treasury securities are purchased by CME, at its discretion, using cash collateral. The benefits, including interest earned, and risks of ownership accrue to CME. Interest earned is included in investment income on the consolidated statements of income. At March 31, 2015, the amortized cost and fair value of the U.S. Treasury securities were both $23.0 billion. The U.S. Treasury securities will mature in the second quarter of 2015. Performance bonds and guaranty fund contribution assets also include overnight reverse repurchase agreements that were purchased by CME, at its discretion, using cash collateral. The fair value of the overnight securities under the reverse repurchase agreements was $2.2 billion at March 31, 2015.
	Clearing House Contract Settlement. CME Clearing 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 Clearing 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-only credit default swap 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. During the first quarter of 2015, CME Clearing and CMECE transferred an average of approximately $4.5 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 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 March 31, 2015.

Intangible_Assets_And_Goodwill

Intangible Assets And Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets And Goodwill	Intangible Assets
	Intangible assets consisted of the following at March 31, 2015 and December 31, 2014:
			March 31, 2015							December 31, 2014
	(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	$	(682.8	)	$	2,156.00	$	2,838.80	$	(658.8	)	$	2,180.00
	Technology-related intellectual property		29.4		(24.4		)	5		29.4		(23.5		)	5.9
	Other		2.4		(0.9		)	1.5		2.4		(0.9		)	1.5
	Total amortizable intangible assets		$	2,870.60	$	(708.1	)	2,162.50		$	2,870.60	$	(683.2	)	2,187.40
	Indefinite-Lived Intangible Assets:
	Trade names							450							450
	Total intangible assets – other, net							$	2,612.50						$	2,637.40
	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 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 $24.9 million and $25.2 million for the quarters ended March 31, 2015 and 2014, respectively. As of March 31, 2015, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:
	(in millions)	Amortization Expense
	Remainder of 2015	$	74.6
	2016	96.1
	2017	95.5
	2018	94.7
	2019	94.7
	2020	94.7
	Thereafter	1,612.20

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	Debt
	Long-term debt consisted of the following at March 31, 2015 and December 31, 2014:
	(in millions)		March 31, 2015		December 31, 2014
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%(1)		$	611.1	$	611
	$750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2)		748.3		748.2
	$750.0 million fixed rate notes due March 2025, stated rate of 3.00%(3)		743.8		—
	$750.0 million fixed rates notes due September 2043, stated rate of 5.30% (4)		748.7		748.7
	Total long-term debt		$	2,851.90	$	2,107.90
	-1	In February 2010, 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 4.46%.
	-2	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%.
	-3	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%
	-4	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 as of March 31, 2015:
	(in millions)	Par Value
	2016	$	—
	2017	—
	2018	612.5
	2019	—
	2020	—
	Thereafter	2,250.00
	On March 19, 2015, the company entered into a $2.3 billion multi-currency senior revolving credit facility with various financial institutions, which expires in March 2020. The company has the option to increase the facility up to $3.0 billion. This credit facility replaces the existing $1.8 billion multi-currency senior revolving credit facility that was due to expire in January 2016.

Contingencies

Contingencies	3 Months Ended
	Mar. 31, 2015
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. The Fifth Market legal matter involves an alleged infringement of intellectual property which, due to its nature, involves a potential liability that is uncertain, difficult to quantify and involves a wide range of potential outcomes. We expect the re-examination by the USPTO in the Fifth Market matter, including any appeals thereof, to result in a determination of the validity of the patent at issue which we expect will have an impact on the merits of the matter. 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 loss in the unlikely event it were found to be liable at trial in the matter.
	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. NYMEX’s motion to dismiss was denied in September 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 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 March 31, 2015 and December 31, 2014, the company had accrued $3.5 million and $4.3 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	3 Months Ended
	Mar. 31, 2015
Guarantees [Abstract]
Guarantees	Guarantees
	Mutual Offset Agreement. CME and Singapore Exchange Limited (SGX) have a mutual offset agreement with a current term through October 2015. 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 March 31, 2015, CME was contingently liable to SGX on letters of credit totaling $410.0 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 March 31, 2015.
	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 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 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 March 31, 2015.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Notes)	3 Months Ended
	Mar. 31, 2015
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, 2014	$	(22.9	)	$	(31.3	)	$	62.6		$	(2.2	)	$	6.2
	Other comprehensive income before reclassifications and income tax benefit (expense)	(27.7		)	(0.3		)	(4.7		)	(4.0		)	(36.7		)
	Amounts reclassified from accumulated other comprehensive income	—			0.7			1.5			—			2.2
	Income tax benefit (expense)	—			(0.2		)	1.2			1.5			2.5
	Net current period other comprehensive income attributable to CME Group	(27.7		)	0.2			(2.0		)	(2.5		)	(32.0		)
	Balance at March 31, 2015	$	(50.6	)	$	(31.1	)	$	60.6		$	(4.7	)	$	(25.8	)
	(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)	24.9			(3.2		)	—			2.4			24.1
	Amounts reclassified from accumulated other comprehensive income	—			0.1			(0.3		)	—			(0.2		)
	Income tax benefit (expense)	—			1.2			0.1			(0.9		)	0.4
	Net current period other comprehensive income attributable to CME Group	24.9			(1.9		)	(0.2		)	1.5			24.3
	Balance at March 31, 2014	$	123.8		$	(14.7	)	$	64.8		$	2.4		$	176.3

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
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 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 and liabilities included in level 2 generally consist of asset-backed securities and interest rate swap contracts. 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 interest rate swap contracts using standard valuation models with market-based observable inputs including forward and spot exchange rates and interest rate curves.
	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 ranging from 75% to 100%. Significant changes 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 March 31, 2015 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 tables present financial instruments measured at fair value on a recurring basis:
			March 31, 2015
	(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		59.1		—		—		59.1
	Equity securities		0.1		—		—		0.1
	Asset-backed securities		—		0.4		—		0.4
	Total Marketable Securities		78.4		0.4		—		78.8
	Performance bonds and guaranty fund contributions:
	U.S. Treasury securities (1)		23,004.50		—		—		23,004.50
	Equity investments		404.4		—		—		404.4
	Total Assets at Fair Value		$	23,487.30	$	0.4	$	—	$	23,487.70
	Liabilities at Fair Value:
	Contingent consideration		$	—	$	—	$	17.8	$	17.8
	Total Liabilities at Fair Value		$	—	$	—	$	17.8	$	17.8
	(1) Performance bonds and guaranty fund contributions on the consolidated balance sheet at March 31, 2015 include cash collateral that has been invested in U.S. Treasury securities.
	There were no transfers of assets or liabilities between level 1, level 2 and level 3 during the first quarter of 2015. The following is a reconciliation of level 3 liabilities valued at fair value on a recurring basis during the first quarter of 2015. There were no level 3 assets valued at fair value on a recurring basis during the first quarter of 2015.
	(in millions)	Contingent Consideration
	Fair value of liability at December 31, 2014	$	17.7
	Realized and unrealized (gains) losses:
	Included in other expenses	0.1
	Fair value of liability at March 31, 2015	$	17.8
	There were no level 3 assets or level 3 liabilities valued at fair value on a nonrecurring basis during the first quarter of 2015.
	The following presents the estimated fair value of fixed rate notes, which are carried at amortized cost on the consolidated balance sheets. The fair values of the fixed rate notes due 2022, 2025 and 2043, which are classified as level 2 under the fair value hierarchy, were estimated using quoted market prices. The fair value of the fixed rate notes due 2018, which are classified as level 3 under the fair value hierarchy, was based on the price to redeem the notes in early April 2015. At March 31, 2015, the fair values of the fixed rate notes were as follows:
	(in millions)	Fair Value
	Level 2:
	$750.0 million fixed rate notes due September 2022, stated rate of 3.00%	$	779.4
	$750.0 million fixed rate notes due March 2025, stated rate of 3.00%	759.3
	$750.0 million fixed rates notes due September 2043, stated rate of 5.30%	938.7
	Level 3:
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%	674.7

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
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
		March 31,
	(in thousands)	2015			2014
	Stock options	514			1,498
	Stock awards	24			4
	Total	538			1,502
	The following table presents the earnings per share calculation for the periods presented:
			Quarter Ended
			March 31,
			2015			2014
	Net Income Attributable to CME Group (in millions)		$	330.4		$	266.8
	Weighted Average Number of Common Shares (in thousands):
	Basic		335,680			333,905
	Effect of stock options and restricted stock awards		1,736			1,739
	Diluted		337,416			335,644
	Earnings per Common Share Attributable to CME Group:
	Basic		$	0.98		$	0.8
	Diluted		0.98			0.79

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
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:
	In April 2015, the company repurchased the $612.5 million fixed rate notes due 2018 and paid a call premium of $60.5 million. As a result of the transaction, the company recognized a net loss on early extinguishment of debt of $63.6 million in the second quarter of 2015, which includes the call premium.

Intangible_Assets_And_Goodwill1

Intangible Assets And Goodwill (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Components of intangible assets	Intangible assets consisted of the following at March 31, 2015 and December 31, 2014:
			March 31, 2015							December 31, 2014
	(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	$	(682.8	)	$	2,156.00	$	2,838.80	$	(658.8	)	$	2,180.00
	Technology-related intellectual property		29.4		(24.4		)	5		29.4		(23.5		)	5.9
	Other		2.4		(0.9		)	1.5		2.4		(0.9		)	1.5
	Total amortizable intangible assets		$	2,870.60	$	(708.1	)	2,162.50		$	2,870.60	$	(683.2	)	2,187.40
	Indefinite-Lived Intangible Assets:
	Trade names							450							450
	Total intangible assets – other, net							$	2,612.50						$	2,637.40
	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 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 March 31, 2015, the future estimated amortization expense related to amortizable intangible assets is expected to be as follows:
	(in millions)	Amortization Expense
	Remainder of 2015	$	74.6
	2016	96.1
	2017	95.5
	2018	94.7
	2019	94.7
	2020	94.7
	Thereafter	1,612.20

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule Of Short-Term And Long-Term Debt	Long-term debt consisted of the following at March 31, 2015 and December 31, 2014:
	(in millions)		March 31, 2015		December 31, 2014
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%(1)		$	611.1	$	611
	$750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2)		748.3		748.2
	$750.0 million fixed rate notes due March 2025, stated rate of 3.00%(3)		743.8		—
	$750.0 million fixed rates notes due September 2043, stated rate of 5.30% (4)		748.7		748.7
	Total long-term debt		$	2,851.90	$	2,107.90
	-1	In February 2010, 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 4.46%.
	-2	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%.
	-3	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%
	-4	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 as of March 31, 2015:
	(in millions)	Par Value
	2016	$	—
	2017	—
	2018	612.5
	2019	—
	2020	—
	Thereafter	2,250.00

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
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, 2014	$	(22.9	)	$	(31.3	)	$	62.6		$	(2.2	)	$	6.2
	Other comprehensive income before reclassifications and income tax benefit (expense)	(27.7		)	(0.3		)	(4.7		)	(4.0		)	(36.7		)
	Amounts reclassified from accumulated other comprehensive income	—			0.7			1.5			—			2.2
	Income tax benefit (expense)	—			(0.2		)	1.2			1.5			2.5
	Net current period other comprehensive income attributable to CME Group	(27.7		)	0.2			(2.0		)	(2.5		)	(32.0		)
	Balance at March 31, 2015	$	(50.6	)	$	(31.1	)	$	60.6		$	(4.7	)	$	(25.8	)
	(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)	24.9			(3.2		)	—			2.4			24.1
	Amounts reclassified from accumulated other comprehensive income	—			0.1			(0.3		)	—			(0.2		)
	Income tax benefit (expense)	—			1.2			0.1			(0.9		)	0.4
	Net current period other comprehensive income attributable to CME Group	24.9			(1.9		)	(0.2		)	1.5			24.3
	Balance at March 31, 2014	$	123.8		$	(14.7	)	$	64.8		$	2.4		$	176.3

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
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:
			March 31, 2015
	(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		59.1		—		—		59.1
	Equity securities		0.1		—		—		0.1
	Asset-backed securities		—		0.4		—		0.4
	Total Marketable Securities		78.4		0.4		—		78.8
	Performance bonds and guaranty fund contributions:
	U.S. Treasury securities (1)		23,004.50		—		—		23,004.50
	Equity investments		404.4		—		—		404.4
	Total Assets at Fair Value		$	23,487.30	$	0.4	$	—	$	23,487.70
	Liabilities at Fair Value:
	Contingent consideration		$	—	$	—	$	17.8	$	17.8
	Total Liabilities at Fair Value		$	—	$	—	$	17.8	$	17.8
	(1) Performance bonds and guaranty fund contributions on the consolidated balance sheet at March 31, 2015 include cash collateral that has been invested in U.S. Treasury securities.
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 level 3 liabilities valued at fair value on a recurring basis during the first quarter of 2015. There were no level 3 assets valued at fair value on a recurring basis during the first quarter of 2015.
	(in millions)	Contingent Consideration
	Fair value of liability at December 31, 2014	$	17.7
	Realized and unrealized (gains) losses:
	Included in other expenses	0.1
	Fair value of liability at March 31, 2015	$	17.8
Fair value of Debt Instruments [Table Text Block]	The fair value of the fixed rate notes due 2018, which are classified as level 3 under the fair value hierarchy, was based on the price to redeem the notes in early April 2015. At March 31, 2015, the fair values of the fixed rate notes were as follows:
	(in millions)	Fair Value
	Level 2:
	$750.0 million fixed rate notes due September 2022, stated rate of 3.00%	$	779.4
	$750.0 million fixed rate notes due March 2025, stated rate of 3.00%	759.3
	$750.0 million fixed rates notes due September 2043, stated rate of 5.30%	938.7
	Level 3:
	$612.5 million fixed rate notes due March 2018, stated rate of 4.40%	674.7

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
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
		March 31,
	(in thousands)	2015			2014
	Stock options	514			1,498
	Stock awards	24			4
	Total	538			1,502
Basic And Diluted Earnings Per Share	The following table presents the earnings per share calculation for the periods presented:
			Quarter Ended
			March 31,
			2015			2014
	Net Income Attributable to CME Group (in millions)		$	330.4		$	266.8
	Weighted Average Number of Common Shares (in thousands):
	Basic		335,680			333,905
	Effect of stock options and restricted stock awards		1,736			1,739
	Diluted		337,416			335,644
	Earnings per Common Share Attributable to CME Group:
	Basic		$	0.98		$	0.8
	Diluted		0.98			0.79

Performance_Bonds_and_Guaranty1

Performance Bonds and Guaranty Fund Contributions (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Cash and cash equivalents	$1,694,800,000	$1,366,100,000	$1,053,700,000	$2,469,700,000
Average Daily Clearing Settlement	4,500,000,000
US Treasury Securities [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	23,000,000,000
Cash and Cash Equivalents, Fair Value Disclosure	23,000,000,000
Repurchase Agreements [Member]
Guarantor Obligations [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$2,200,000,000

Intangible_Assets_And_Goodwill2

Intangible Assets And Goodwill (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of purchased intangibles	$24.90	$25.20

Intangible_Assets_And_Goodwill3

Intangible Assets And Goodwill (Components Of Intangible Assets) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Millions, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	$2,612.50		$2,637.40
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	-682.8		-658.8
Net book value	2,156		2,180
Technology-Related Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	29.4		29.4
Accumulated amortization	-24.4		-23.5
Net book value	5		5.9
Total Amortizable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,870.60		2,870.60
Accumulated amortization	-708.1		-683.2
Net book value	2,162.50		2,187.40
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2.4		2.4
Accumulated amortization	-0.9		-0.9
Net book value	$1.50		$1.50
[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_Goodwill4

Intangible Assets And Goodwill (Future Estimated Amortization Expense) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$74.60
2016	96.1
2017	95.5
2018	94.7
2019	94.7
2020	94.7
Thereafter	$1,612.20

Debt_Schedule_Of_ShortTerm_And

Debt (Schedule Of Short-Term And Long-Term Debt) (Details) (USD $)	1 Months Ended				3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2013	Sep. 30, 2012	Feb. 28, 2010	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$2,851.90				$2,851.90	$2,107.90
Forward starting interest rate swap agreement fixed rate	3.11%	4.73%	3.32%	4.46%
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Debt Instrument [Line Items]
Long-term debt	611.1				611.1	611
Debt Instrument, Face Amount	612.5				612.5
Debt Instrument, Maturity Date					1-Mar-18
Debt Instrument, Interest Rate, Stated Percentage	4.40%				4.40%
$750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]
Debt Instrument [Line Items]
Long-term debt	748.3				748.3	748.2
Debt Instrument, Face Amount	750				750
Debt Instrument, Maturity Date					1-Sep-22
Debt Instrument, Interest Rate, Stated Percentage	3.00%				3.00%
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00%
Debt Instrument [Line Items]
Long-term debt	743.8				743.8	0
Debt Instrument, Face Amount	750				750
Debt Instrument, Maturity Date					1-Mar-25
Debt Instrument, Interest Rate, Stated Percentage	3.00%				3.00%
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Debt Instrument [Line Items]
Long-term debt	748.7				748.7	748.7
Debt Instrument, Face Amount	$750				$750
Debt Instrument, Maturity Date					1-Sep-43
Debt Instrument, Interest Rate, Stated Percentage	5.30%				5.30%

Debt_Schedule_Of_Maturities_Of

Debt (Schedule Of Maturities Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Debt Disclosure [Abstract]
2016	$0
2017	0
2018	612.5
2019	0
2020	0
Thereafter	$2,250

Debt_Fair_Value_Of_Fixed_Rate_

Debt (Fair Value Of Fixed Rate Notes) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$612.50
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, 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, Face Amount	$750
Debt Instrument, Maturity Date	1-Sep-43

Debt_Debt_ShortTerm_Debt_Detai

Debt Debt (Short-Term Debt) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Long-term Line of Credit	$2,300,000,000	$1,800,000,000
Line of Credit Facility, Maximum Borrowing Capacity	3,000,000,000
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount	$750,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.30%

Contingencies_Details

Contingencies (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Loss Contingency [Abstract]
Accrued liability related to all outstanding legal matters	$3.50	$4.30

Guarantees_Details

Guarantees (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
	years
Guarantor Obligations [Line Items]
Agreement automatic renewal period (in years)	1
Contingent liability to SGX, amount of irrevocable letters of credit	$410,000,000
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
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Balance	$20,923.50
Net unrealized holding gains arising during the period	-27.7	24.9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	-0.3	-3.2
Net unrealized holding losses arising during the period	-4.7	0
Foreign currency translation adjustment	-4	2.4
Amortization of net actuarial (gains) losses included in pension expense	0.7	0.1
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0.3	0.3
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0
Defined benefit plans, income tax benefit (expense)	0.2	-1.2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	-1.5	0.9
Other Comprehensive Income (Loss), Net of Tax	-32	24.3
Balance	21,095.50
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	6.2	152
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2.2	-0.2
Comprehensive Income Before Reclassification Adjustments	-36.7	24.1
Comprehensive Income, Tax	2.5	0.4
Other Comprehensive Income (Loss), Net of Tax	-32	24.3
Balance	-25.8	176.3
Accumulated Translation Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Balance	-2.2	0.9
Reclassification adjustment for loss included in net income	0	0
Foreign currency translation adjustment	-4	2.4
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1.5	-0.9
Other Comprehensive Income (Loss), Net of Tax	-2.5	1.5
Balance	-4.7	2.4
Investment Securities [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Balance	-22.9	98.9
Net unrealized holding gains arising during the period	-27.7	24.9
Reclassification adjustment for gains included in investment income	0	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	-27.7	24.9
Balance	-50.6	123.8
Derivative Financial Instruments, Assets [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Balance	62.6	65
Net unrealized holding losses arising during the period	-4.7	0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	1.5	-0.3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	1.2	0.1
Other Comprehensive Income (Loss), Net of Tax	-2	-0.2
Balance	60.6	64.8
Pension Plans, Defined Benefit [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Balance	-31.3	-12.8
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	-0.3	-3.2
Amortization of net actuarial (gains) losses included in pension expense	0.7	0.1
Defined benefit plans, income tax benefit (expense)	-0.2	1.2
Other Comprehensive Income (Loss), Net of Tax	0.2	-1.9
Balance	($31.10)	($14.70)

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Good Faith and Margin Deposits with Broker-Dealers	$45,174.20	$40,566.80
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	78.8
Good Faith and Margin Deposits with Broker-Dealers	23,004.50
Investment Owned, at Fair Value	404.4
Total Assets at Fair Value	23,487.70
Contingent consideration at Fair Value	17.8
Total liabilities at fair value	17.8
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	59.1
Fair Value, Measurements, Recurring [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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	78.4
Good Faith and Margin Deposits with Broker-Dealers	23,004.50
Investment Owned, at Fair Value	404.4
Total Assets at Fair Value	23,487.30
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	59.1
Fair Value, Measurements, Recurring [Member] | 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, 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 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, 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	17.8	17.7
Total liabilities at fair value	17.8
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, Recurring [Member] | 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_Measurements_Reconc

Fair Value Measurements (Reconciliation Using Significant Unobservable Inputs) (Details) (Fair Value, Measurements, Recurring [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Contingent consideration at Fair Value	$17.80
Fair Value, Inputs, Level 3 [Member]
Contingent consideration at Fair Value	17.8	17.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in operating expense	$0.10

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements Narrative (Detail) (Details)	3 Months Ended
	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation model discount rate	20.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valulation Model Probability Low Range	75.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Model Probability High Range	100.00%

Fair_Value_Measurements_Fair_V1

Fair Value Measurements Fair Value of Debt Instruments (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Debt Instrument, Face Amount	$750
Debt Instrument, Maturity Date	1-Sep-43
Debt Instrument, Interest Rate, Stated Percentage	5.30%
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00%
Debt Instrument, Face Amount	750
Debt Instrument, Maturity Date	1-Mar-25
Debt Instrument, Interest Rate, Stated Percentage	3.00%
$750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]
Debt Instrument, Face Amount	750
Debt Instrument, Maturity Date	1-Sep-22
Debt Instrument, Interest Rate, Stated Percentage	3.00%
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Debt Instrument, Face Amount	612.5
Debt Instrument, Maturity Date	1-Mar-18
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Fair Value, Inputs, Level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Debt Instrument, Fair Value Disclosure	938.7
Fair Value, Inputs, Level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00%
Debt Instrument, Fair Value Disclosure	759.3
Fair Value, Inputs, Level 2 [Member] | $750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]
Debt Instrument, Fair Value Disclosure	779.4
Fair Value, Inputs, Level 3 [Member] | $612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Debt Instrument, Fair Value Disclosure	$674.70

Earnings_Per_Share_AntiDilutiv

Earnings Per Share Anti-Dilutive Securities (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	538	1,502
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	514	1,498
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	24	4

Earnings_Per_Share_Net_Income_

Earnings Per Share (Net Income Attributable To CME Group) (Details) (USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Income Attributable to CME Group	$330.40	$266.80
Basic (in shares)	335,680	333,905
Dilutive Securities, Effect on EPS	1,736	1,739
Diluted (in shares)	337,416	335,644
Earnings per common share, basic (in dollars per share)	$0.98	$0.80
Earnings per common share, diluted (in dollars per share)	$0.98	$0.79
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Income Attributable to CME Group	$330.40	$266.80