CME (CME) 10-Q 5 Aug 15 2015 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 15, 2015
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,015
Entity Registrant Name	CME GROUP INC.
Entity Central Index Key	1,156,375
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		337,756,060
Class B Common Stock, Class B-1 [Member]
Entity Common Stock, Shares Outstanding		625
Class B Common Stock, Class B-2 [Member]
Entity Common Stock, Shares Outstanding		813
Class B Common Stock, Class B-3 [Member]
Entity Common Stock, Shares Outstanding		1,287
Class B Common Stock, Class B-4 [Member]
Entity Common Stock, Shares Outstanding		413

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents		$ 1,151	$ 1,366.1
Marketable securities		76.3	74.7
Accounts receivable, net of allowance		399.9	341.2
Other current assets		260	196.5
Cash performance bonds and guaranty fund contributions		42,167.9	40,566.8
Total current assets		44,055.1	42,545.3
Property, net of accumulated depreciation and amortization		499.2	508.9
Intangible assets - trading products	[1]	17,175.3	17,175.3
Intangible assets - other, net		2,587.6	2,637.4
Goodwill		7,569	7,569
Other assets		1,776.9	1,805.6
Total Assets		73,663.1	72,241.5
Liabilities and Shareholders' Equity
Accounts payable		22.1	36.9
Other current liabilities		242.6	927.5
Cash performance bonds and guaranty fund contributions		42,167.9	40,566.8
Total current liabilities		42,432.6	41,531.2
Long-term debt		2,241	2,107.9
Deferred income tax liabilities, net		7,339.8	7,302.7
Other liabilities		390.9	376.2
Total Liabilities		52,404.3	51,318
Shareholders' Equity:
Preferred stock, $0.01 par value, 10,000 shares authorized, none issued or outstanding		0	0
Additional paid-in capital		17,674.8	17,596.6
Retained earnings		3,575.5	3,317.3
Accumulated other comprehensive income (loss)		5.1	6.2
Total Shareholders' Equity		21,258.8	20,923.5
Total Liabilities and Shareholders' Equity		73,663.1	72,241.5
Class A Common Stock [Member]
Shareholders' Equity:
Common stock		3.4	3.4
Class B Common Stock [Member]
Shareholders' Equity:
Common stock		$ 0	$ 0
[1]	)Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance	$ 0.9	$ 1.2
Restricted cash, current	32	37
Accumulated depreciation and amortization, property	781.5	741
Restricted cash, noncurrent	$ 73.5	$ 72.4
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)	336,186	335,452
Common stock, shares outstanding (in shares)	336,186	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 Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Clearing and transaction fees	$ 681.8	$ 609.3	$ 1,390	$ 1,261.5
Market data and information services	102.8	89.6	200.8	179
Access and communication fees	21.5	20.4	42.8	40.8
Other	13.9	12.3	29.1	27.7
Total Revenues	820	731.6	1,662.7	1,509
Expenses
Compensation and benefits	141.5	139.7	282.8	275.2
Communications	6.6	8.3	14.2	16.5
Technology support services	16.1	14.6	31.7	28.5
Professional fees and outside services	27.7	37.5	56.8	67.1
Amortization of purchased intangibles	25	25.2	49.9	50.4
Depreciation and amortization	33.3	34.3	65.1	68.4
Occupancy and building operations	23.5	23.2	46.3	46.4
Licensing and other fee agreements	28.8	25.7	59.4	54.7
Other	22.4	11.1	54.1	35.3
Total Expenses	324.9	319.6	660.3	642.5
Operating Income	495.1	412	1,002.4	866.5
Non-Operating Income (Expense)
Investment income	18.5	15.1	24.2	18.3
Gain (Loss) on Derivative Instruments, Net, Pretax	0	0	(1.8)	0
Interest and other borrowing costs	(28.6)	(28.3)	(60.2)	(62)
Equity in net losses of unconsolidated subsidiaries	26	21.5	48.5	43.9
Other non-operating income (expense)	(62.9)	1.8	(41.2)	1.8
Total Non-Operating	(47)	10.1	(30.5)	2
Income before Income Taxes	448.1	422.1	971.9	868.5
Income tax provision	183.1	158.3	376.5	338.1
Net income	265	263.8	595.4	530.4
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	0	(0.2)
Net Income Attributable to CME Group	$ 265	$ 263.8	$ 595.4	$ 530.6
Earnings per Common Share Attributable to CME Group:
Basic (in dollars per share)	$ 0.79	$ 0.79	$ 1.77	$ 1.59
Diluted (in dollars per share)	$ 0.78	$ 0.79	$ 1.76	$ 1.58
Weighted Average Number of Common Shares:
Basic (in shares)	336,036	334,097	335,859	334,002
Diluted (in shares)	337,796	335,800	337,574	335,705

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 265	$ 263.8	$ 595.4	$ 530.4
Other comprehensive income, net of tax
Net unrealized holding gains arising during the period	36.9	31	9.2	55.9
Reclassification adjustment for gains included in investment income	(6)	0	(6)	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	1.2	(1.5)	1.2	(1.5)
Investment securities, net	32.1	29.5	4.4	54.4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0	0	(0.3)	(3.2)
Amortization of net actuarial (gains) losses included in pension expense	0.7	0.1	1.4	0.2
Defined benefit plans, income tax benefit (expense)	(0.2)	(0.1)	(0.4)	1.1
Defined benefit plans, net	0.5	0	0.7	(1.9)
Net unrealized holding losses arising during the period	0	0	(4.7)	0
Loss on Cash Flow Hedge Ineffectiveness	0	0	1.8	0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	(0.3)	(0.4)	(0.6)	(0.7)
Derivative instruments, income tax benefit (expense)	0.2	0.2	1.4	0.3
Derivative instruments, net	(0.1)	(0.2)	(2.1)	(0.4)
Foreign currency translation adjustment	(2.6)	1.8	(6.6)	4.2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	1	(0.7)	2.5	(1.6)
Foreign currency translation, net	(1.6)	1.1	(4.1)	2.6
Other Comprehensive Income (Loss), Net of Tax	30.9	30.4	(1.1)	54.7
Comprehensive income	295.9	294.2	594.3	585.1
Less: comprehensive income attributable to redeemable non-controlling interest	0	0	0	(0.2)
Comprehensive income attributable to CME Group	$ 295.9	$ 294.2	$ 594.3	$ 585.3

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock And Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]	Class A Common Stock [Member]	Class A Common Stock [Member]Common Stock And Additional Paid-In Capital [Member]	Class B Common Stock [Member]	Class B Common Stock [Member]Common Stock And Additional Paid-In Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 21,160.5
Balance (in shares) at Dec. 31, 2013								333,852		3
Balance at Dec. 31, 2013		$ 17,508.2	$ 3,494.6	$ 152	$ 21,154.8
Stockholders' Equity Attributable to Noncontrolling Interest at Dec. 31, 2013						$ 5.7
Net Income Attributable to CME Group	530.6		530.6		530.6
Net Income (Loss) Attributable to Noncontrolling Interest	(0.2)					(0.2)
Net income	530.4
Other Comprehensive Income (Loss), Net of Tax	54.7			54.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	54.7			54.7	54.7
Dividends on common stock per share	(315.4)		(315.4)		(315.4)
Adjustments to Additional Paid in Capital, Other	(5.5)					(5.5)
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 Issued To Related Parties During Period Shares								24
Stock Issued To Related Parties During Period Value	1.7	1.7			1.7
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
Stock Granted, Value, Share-based Compensation, Gross	26.4	26.4			26.4
Stockholders' Equity Attributable to Noncontrolling Interest at Jun. 30, 2014						$ 0
Balance (in shares) at Jun. 30, 2014								334,251		3
Balance at Jun. 30, 2014		17,548.9	3,709.8	206.7	21,465.4
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	21,465.4
Balance (in shares) at Dec. 31, 2014							335,452	335,452	3	3
Balance at Dec. 31, 2014	20,923.5	17,600	3,317.3	6.2	20,923.5
Net Income Attributable to CME Group	595.4		595.4		595.4
Net Income (Loss) Attributable to Noncontrolling Interest	0
Other Comprehensive Income (Loss), Net of Tax	(1.1)			(1.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent					(1.1)
Dividends on common stock per share			(337.2)		(337.2)
Exercise of stock options (in shares)								652
Exercise of stock options		42.1			42.1
Excess tax benefits from option exercises and restricted stock vesting		1.3			1.3
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures								46
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		(2.3)			(2.3)
Stock Issued To Related Parties During Period Shares								26
Stock Issued To Related Parties During Period Value		2.4			2.4
Stock Issued During Period, Shares, Employee Stock Purchase Plans								10
Stock Issued During Period, Value, Employee Stock Purchase Plan		1			1
Stock Granted, Value, Share-based Compensation, Gross		33.7			33.7
Balance (in shares) at Jun. 30, 2015							336,186	336,186	3	3
Balance at Jun. 30, 2015	$ 21,258.8	$ 17,678.2	$ 3,575.5	$ 5.1	$ 21,258.8

Consolidated Statements Of Sha7

Consolidated Statements Of Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock, per share (in dollars per share)	$ 1	$ 0.94

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities
Net income	$ 595.4	$ 530.4
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	33.7	26.4
Amortization of purchased intangibles	49.9	50.4
Depreciation and amortization	65.1	68.4
Gain (Loss) on Sale of Investments	(5.9)	0
Gains (Losses) on Extinguishment of Debt	61.8	0
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	(5.3)	(19.2)
Deferred income taxes	41.3	17.5
Change in:
Accounts receivable	(58.4)	(31.9)
Other current assets	8.1	(4)
Other assets	(15.1)	3.8
Accounts payable	(14.8)	(4.1)
Income taxes payable	(55.5)	(27.5)
Other current liabilities	(26.2)	(55.2)
Other liabilities	(0.1)	(0.9)
Other	3.7	0.6
Net Cash Provided by Operating Activities	677.7	554.7
Cash Flows from Investing Activities
Proceeds from maturities of available-for-sale marketable securities	19.1	18.3
Purchases of available-for-sale marketable securities	(19.2)	(19.1)
Purchases of property	(60.7)	(77.4)
Proceeds from sale of building property	0	7.9
Payments to Acquire Investments	5	0
Proceeds from Sale of Available-for-sale Securities, Equity	57.7	0
Settlement of derivative related to debt issuance	7	0
Net Cash Used in Investing Activities	(1.1)	(70.3)
Cash Flows from Financing Activities
Proceeds from other borrowings, net of issuance costs	743.7	0
Repayment of other borrowings	(673)	(750)
Cash dividends	(1,006.7)	(1,182.1)
Proceeds from exercise of stock options	42.1	11.5
Excess tax benefits related to employee option exercises and restricted stock vesting	1.3	2.9
Proceeds from (Payments for) Other Financing Activities	0.9	0.9
Net Cash Used in Financing Activities	(891.7)	(1,916.8)
Net change in cash and cash equivalents	(215.1)	(1,432.4)
Cash and cash equivalents, beginning of period	1,366.1	2,469.7
Cash and Cash Equivalents, End of Period	1,151	1,037.3
Supplemental Disclosure of Cash Flow Information
Income taxes paid	393.3	322
Interest paid	$ 46.3	$ 66.8

Basis Of Presentation

Basis Of Presentation	6 Months Ended
	Jun. 30, 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 June 30, 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)	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 2015 , the amortized cost and fair value of the U.S. Treasury securities were both $17.6 billion . The U.S. Treasury securities will mature in the third 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 $2.5 billion at June 30, 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 six months of 2015, CME Clearing and CMECE transferred an average of approximately $4.2 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 June 30, 2015 .

Intangible Assets And Goodwill

Intangible Assets And Goodwill	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets And Goodwill	Intangible Assets Intangible assets consisted of the following at June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in millions) Assigned Value Accumulated Amortization Net Book Value Assigned Value Accumulated Amortization Net Book Value Amortizable Intangible Assets: Clearing firm, market data and other customer relationships $ 2,838.8 $ (706.7 ) $ 2,132.1 $ 2,838.8 $ (658.8 ) $ 2,180.0 Technology-related intellectual property 29.4 (25.4 ) 4.0 29.4 (23.5 ) 5.9 Other 2.4 (0.9 ) 1.5 2.4 (0.9 ) 1.5 Total amortizable intangible assets $ 2,870.6 $ (733.0 ) 2,137.6 $ 2,870.6 $ (683.2 ) 2,187.4 Indefinite-Lived Intangible Assets: Trade names 450.0 450.0 Total intangible assets – other, net $ 2,587.6 $ 2,637.4 Trading products (1) $ 17,175.3 $ 17,175.3 (1) Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits. Total amortization expense for intangible assets was $25.0 million and $25.2 million for the quarters ended June 30, 2015 and 2014 , respectively. Total amortization expense for intangible assets was $49.9 million and $50.4 million for the six months ended June 30, 2015 and 2014 , respectively. As of June 30, 2015 , the future estimated amortization expense related to amortizable intangible assets is expected to be as follows: (in millions) Amortization Expense Remainder of 2015 $ 49.7 2016 96.1 2017 95.5 2018 94.7 2019 94.7 2020 94.7 Thereafter 1,612.2

Long-Term Investments (Notes)

Long-Term Investments (Notes)	6 Months Ended
	Jun. 30, 2015
Investments, All Other Investments [Abstract]
Investments and Other Noncurrent Assets [Text Block]	Long-Term Investments In the second quarter of 2015, the company sold approximately 14.3 million shares of BM&FBOVESPA S.A. (BM&FBOVESPA) and recognized a net gain of $5.9 million within investment income on the consolidated statements of income. The company continues to own an approximate 5% interest in BM&FBOVESPA. The fair value and cost basis of the remaining investment in BM&FBOVESPA are $362.9 million and $353.9 million , respectively.

Debt

Debt	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Debt	Debt In April 2015, the company repaid 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 debt prepayment costs of $61.8 million in the second quarter of 2015, which includes the call premium. Long-term debt consisted of the following at June 30, 2015 and December 31, 2014 : (in millions) June 30, 2015 December 31, 2014 $612.5 million fixed rate notes due March 2018, stated rate of 4.40% (1) $ — $ 611.0 $750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2) 748.4 748.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% (3) 743.9 — $750.0 million fixed rates notes due September 2043, stated rate of 5.30% (4) 748.7 748.7 Total long-term debt $ 2,241.0 $ 2,107.9 (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 June 30, 2015 : (in millions) Par Value 2016 $ — 2017 — 2018 — 2019 — 2020 — Thereafter 2,250.0

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 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. CME filed covered business method reviews against both patents for the claims that remain after the reexaminations. All the claims asserted in the litigation have a proceeding instituted against them. The reviews and one reexamination remain under way at the USPTO or are on appeal to the Federal Circuit. 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 and the reviews 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 June 30, 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	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 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 June 30, 2015 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Notes)	6 Months Ended
	Jun. 30, 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) 9.2 (0.3 ) (4.7 ) (6.6 ) (2.4 ) Amounts reclassified from accumulated other comprehensive income (6.0 ) 1.4 1.2 — (3.4 ) Income tax benefit (expense) 1.2 (0.4 ) 1.4 2.5 4.7 Net current period other comprehensive income attributable to CME Group 4.4 0.7 (2.1 ) (4.1 ) (1.1 ) Balance at June 30, 2015 $ (18.5 ) $ (30.6 ) $ 60.5 $ (6.3 ) $ 5.1 (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2013 $ 98.9 $ (12.8 ) $ 65.0 $ 0.9 $ 152.0 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

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 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 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 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 June 30, 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: June 30, 2015 (in millions) Level 1 Level 2 Level 3 Total Assets at Fair Value: Marketable securities: U.S. Treasury securities $ 19.1 $ — $ — $ 19.1 Mutual funds 56.7 — — 56.7 Equity securities 0.1 — — 0.1 Asset-backed securities — 0.4 — 0.4 Total Marketable Securities 75.9 0.4 — 76.3 Performance bonds and guaranty fund contributions: U.S. Treasury securities (1) 17,574.8 — — 17,574.8 Equity investments 383.2 — — 383.2 Total Assets at Fair Value $ 18,033.9 $ 0.4 $ — $ 18,034.3 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 June 30, 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 six months of 2015 . The following is a reconciliation of level 3 liabilities valued at fair value on a recurring basis during the first six months of 2015. There were no level 3 assets valued at fair value on a recurring basis during the first six months 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 June 30, 2015 $ 17.8 There were no level 3 assets or level 3 liabilities valued at fair value on a nonrecurring basis during the first six months 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. At June 30, 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% $ 752.1 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% 727.9 $750.0 million fixed rates notes due September 2043, stated rate of 5.30% 825.8

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 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 Six Months Ended (in thousands) 2015 2014 2015 2014 Stock options 456 1,480 456 1,480 Stock awards 8 — 11 — Total 464 1,480 467 1,480 The following table presents the earnings per share calculation for the periods presented: Quarter Ended Six Months Ended 2015 2014 2015 2014 Net Income Attributable to CME Group (in millions) $ 265.0 $ 263.8 $ 595.4 $ 530.6 Weighted Average Number of Common Shares (in thousands): Basic 336,036 334,097 335,859 334,002 Effect of stock options and restricted stock awards 1,760 1,703 1,715 1,703 Diluted 337,796 335,800 337,574 335,705 Earnings per Common Share Attributable to CME Group: Basic $ 0.79 $ 0.79 $ 1.77 $ 1.59 Diluted 0.78 0.79 1.76 1.58

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 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.

Intangible Assets And Goodwill

Intangible Assets And Goodwill (Tables)	6 Months Ended
	Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Components of intangible assets	Intangible assets consisted of the following at June 30, 2015 and December 31, 2014 : June 30, 2015 December 31, 2014 (in millions) Assigned Value Accumulated Amortization Net Book Value Assigned Value Accumulated Amortization Net Book Value Amortizable Intangible Assets: Clearing firm, market data and other customer relationships $ 2,838.8 $ (706.7 ) $ 2,132.1 $ 2,838.8 $ (658.8 ) $ 2,180.0 Technology-related intellectual property 29.4 (25.4 ) 4.0 29.4 (23.5 ) 5.9 Other 2.4 (0.9 ) 1.5 2.4 (0.9 ) 1.5 Total amortizable intangible assets $ 2,870.6 $ (733.0 ) 2,137.6 $ 2,870.6 $ (683.2 ) 2,187.4 Indefinite-Lived Intangible Assets: Trade names 450.0 450.0 Total intangible assets – other, net $ 2,587.6 $ 2,637.4 Trading products (1) $ 17,175.3 $ 17,175.3 (1) Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits
Future estimated amortization expense	As of June 30, 2015 , the future estimated amortization expense related to amortizable intangible assets is expected to be as follows: (in millions) Amortization Expense Remainder of 2015 $ 49.7 2016 96.1 2017 95.5 2018 94.7 2019 94.7 2020 94.7 Thereafter 1,612.2

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Schedule Of Short-Term And Long-Term Debt	Long-term debt consisted of the following at June 30, 2015 and December 31, 2014 : (in millions) June 30, 2015 December 31, 2014 $612.5 million fixed rate notes due March 2018, stated rate of 4.40% (1) $ — $ 611.0 $750.0 million fixed rate notes due September 2022, stated rate of 3.00% (2) 748.4 748.2 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% (3) 743.9 — $750.0 million fixed rates notes due September 2043, stated rate of 5.30% (4) 748.7 748.7 Total long-term debt $ 2,241.0 $ 2,107.9 (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 June 30, 2015 : (in millions) Par Value 2016 $ — 2017 — 2018 — 2019 — 2020 — Thereafter 2,250.0

Accumulated Other Comprehensi22

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 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) 9.2 (0.3 ) (4.7 ) (6.6 ) (2.4 ) Amounts reclassified from accumulated other comprehensive income (6.0 ) 1.4 1.2 — (3.4 ) Income tax benefit (expense) 1.2 (0.4 ) 1.4 2.5 4.7 Net current period other comprehensive income attributable to CME Group 4.4 0.7 (2.1 ) (4.1 ) (1.1 ) Balance at June 30, 2015 $ (18.5 ) $ (30.6 ) $ 60.5 $ (6.3 ) $ 5.1 (in millions) Investment Securities Defined Benefit Plans Derivative Investments Foreign Currency Translation Total Balance at December 31, 2013 $ 98.9 $ (12.8 ) $ 65.0 $ 0.9 $ 152.0 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

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2015 (in millions) Level 1 Level 2 Level 3 Total Assets at Fair Value: Marketable securities: U.S. Treasury securities $ 19.1 $ — $ — $ 19.1 Mutual funds 56.7 — — 56.7 Equity securities 0.1 — — 0.1 Asset-backed securities — 0.4 — 0.4 Total Marketable Securities 75.9 0.4 — 76.3 Performance bonds and guaranty fund contributions: U.S. Treasury securities (1) 17,574.8 — — 17,574.8 Equity investments 383.2 — — 383.2 Total Assets at Fair Value $ 18,033.9 $ 0.4 $ — $ 18,034.3 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 June 30, 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 six months of 2015. There were no level 3 assets valued at fair value on a recurring basis during the first six months 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 June 30, 2015 $ 17.8
Fair value of Debt Instruments [Table Text Block]	At June 30, 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% $ 752.1 $750.0 million fixed rate notes due March 2025, stated rate of 3.00% 727.9 $750.0 million fixed rates notes due September 2043, stated rate of 5.30% 825.8

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended (in thousands) 2015 2014 2015 2014 Stock options 456 1,480 456 1,480 Stock awards 8 — 11 — Total 464 1,480 467 1,480
Basic And Diluted Earnings Per Share	The following table presents the earnings per share calculation for the periods presented: Quarter Ended Six Months Ended 2015 2014 2015 2014 Net Income Attributable to CME Group (in millions) $ 265.0 $ 263.8 $ 595.4 $ 530.6 Weighted Average Number of Common Shares (in thousands): Basic 336,036 334,097 335,859 334,002 Effect of stock options and restricted stock awards 1,760 1,703 1,715 1,703 Diluted 337,796 335,800 337,574 335,705 Earnings per Common Share Attributable to CME Group: Basic $ 0.79 $ 0.79 $ 1.77 $ 1.59 Diluted 0.78 0.79 1.76 1.58

Performance Bonds and Guarant25

Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Cash and cash equivalents	$ 1,151	$ 1,366.1	$ 1,037.3	$ 2,469.7
Average Daily Clearing Settlement	4,200
US Treasury Securities [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	23,000
Cash and Cash Equivalents, Fair Value Disclosure	17,600
Repurchase Agreements [Member]
Guarantor Obligations [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 2,500

Intangible Assets And Goodwil26

Intangible Assets And Goodwill (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of purchased intangibles	$ 25	$ 25.2	$ 49.9	$ 50.4

Intangible Assets And Goodwil27

Intangible Assets And Goodwill (Components Of Intangible Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets		$ 2,587.6	$ 2,637.4
Other Indefinite-lived Intangible Assets	[1]	17,175.3	17,175.3
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets		450	450
Clearing Firm, Market Data And Other Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2,838.8	2,838.8
Accumulated amortization		(706.7)	(658.8)
Net book value		2,132.1	2,180
Technology-Related Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		29.4	29.4
Accumulated amortization		(25.4)	(23.5)
Net book value		4	5.9
Total Amortizable Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross		2,870.6	2,870.6
Accumulated amortization		(733)	(683.2)
Net book value		2,137.6	2,187.4
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		$ 1.5	$ 1.5
[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 Goodwil28

Intangible Assets And Goodwill (Future Estimated Amortization Expense) (Details) $ in Millions	Jun. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$ 49.7
2,016	96.1
2,017	95.5
2,018	94.7
2,019	94.7
2,020	94.7
Thereafter	$ 1,612.2

Long-Term Investments (Details)

Long-Term Investments (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Investments, All Other Investments [Abstract]
Investment shares sold	14.3
Gain (Loss) on Sale of Investments	$ 5.9	$ 0
Sale of Stock, Percentage of Ownership after Transaction	5.00%
Investment Owned, at Fair Value	$ 362.9
Investment Owned, at Cost	$ 353.9

Debt (Schedule Of Short-Term An

Debt (Schedule Of Short-Term And Long-Term Debt) (Details) - USD ($) $ in Millions	1 Months Ended				6 Months Ended
	Mar. 31, 2015	Sep. 30, 2013	Sep. 30, 2012	Feb. 28, 2010	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt					$ 2,241	$ 2,107.9
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					0	611
Debt Instrument, Face Amount					$ 612.5
Debt Instrument, Maturity Date					Mar. 1, 2018
Debt Instrument, Interest Rate, Stated Percentage					4.40%
$750 Million Fixed Rate Notes Due March 2022, Interest Equal To 3.0% [Member]
Debt Instrument [Line Items]
Long-term debt					$ 748.4	748.2
Debt Instrument, Face Amount					$ 750
Debt Instrument, Maturity Date					Sep. 1, 2022
Debt Instrument, Interest Rate, Stated Percentage					3.00%
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00%
Debt Instrument [Line Items]
Long-term debt					$ 743.9	0
Debt Instrument, Face Amount					$ 750
Debt Instrument, Maturity Date					Mar. 1, 2025
Debt Instrument, Interest Rate, Stated Percentage					3.00%
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Debt Instrument [Line Items]
Long-term debt					$ 748.7	$ 748.7
Debt Instrument, Face Amount					$ 750
Debt Instrument, Maturity Date					Sep. 1, 2043
Debt Instrument, Interest Rate, Stated Percentage					5.30%

Debt (Schedule Of Maturities Of

Debt (Schedule Of Maturities Of Long-Term Debt) (Details) $ in Millions	Jun. 30, 2015USD ($)
Debt Disclosure [Abstract]
2,016	$ 0
2,017	0
2,018	0
2,019	0
2,020	0
Thereafter	$ 2,250

Debt (Fair Value Of Fixed Rate

Debt (Fair Value Of Fixed Rate Notes) (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 612.5
Debt Instrument, Maturity Date	Mar. 1, 2018
$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	Sep. 1, 2022
$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	Sep. 1, 2043

Debt Debt (Short-Term Debt) (De

Debt Debt (Short-Term Debt) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Short-term Debt [Line Items]
Gains (Losses) on Extinguishment of Debt	$ (61.8)	$ 0
$612.5 million fixed rate notes due March 2018, interest equal to 4.40% [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount	612.5
debt call premium	$ 60.5
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Gains (Losses) on Extinguishment of Debt	$ (61.8)
$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%

Contingencies (Details)

Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Loss Contingency [Abstract]
Accrued liability related to all outstanding legal matters	$ 3.5	$ 4.3

Guarantees (Details)

Guarantees (Details) - Jun. 30, 2015	USD ($)years
Guarantor Obligations [Line Items]
Agreement automatic renewal period (in years) | 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 Comprehensi36

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Balance			$ 20,923.5
Net unrealized holding gains arising during the period	$ 36.9	$ 31	9.2	$ 55.9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0	0	(0.3)	(3.2)
Net unrealized holding losses arising during the period	0	0	(4.7)	0
Foreign currency translation adjustment	(2.6)	1.8	(6.6)	4.2
Reclassification adjustment for gains included in investment income	6	0	6	0
Amortization of net actuarial (gains) losses included in pension expense	0.7	0.1	1.4	0.2
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax	0.3	0.4	0.6	0.7
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(1.2)	1.5	(1.2)	1.5
Defined benefit plans, income tax benefit (expense)	0.2	0.1	0.4	(1.1)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(1)	0.7	(2.5)	1.6
Other Comprehensive Income (Loss), Net of Tax	30.9	30.4	(1.1)	54.7
Balance	21,258.8		21,258.8
Accumulated Other Comprehensive Income (Loss) [Member]
Balance			6.2	152
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			(3.4)	(0.5)
Comprehensive Income Before Reclassification Adjustments			(2.4)	56.9
Comprehensive Income, Tax			4.7	(1.7)
Other Comprehensive Income (Loss), Net of Tax			(1.1)	54.7
Balance	5.1	206.7	5.1	206.7
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			(6.6)	4.2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			2.5	(1.6)
Other Comprehensive Income (Loss), Net of Tax			(4.1)	2.6
Balance	(6.3)	3.5	(6.3)	3.5
Investment Securities [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Balance			(22.9)	98.9
Net unrealized holding gains arising during the period			9.2	55.9
Reclassification adjustment for gains included in investment income			(6)	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax			1.2	(1.5)
Other Comprehensive Income (Loss), Net of Tax			4.4	54.4
Balance	(18.5)	153.3	(18.5)	153.3
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			1.2	(0.7)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			1.4	0.3
Other Comprehensive Income (Loss), Net of Tax			(2.1)	(0.4)
Balance	60.5	64.6	60.5	64.6
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			1.4	0.2
Defined benefit plans, income tax benefit (expense)			(0.4)	1.1
Other Comprehensive Income (Loss), Net of Tax			0.7	(1.9)
Balance	$ (30.6)	$ (14.7)	$ (30.6)	$ (14.7)

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Good Faith and Margin Deposits with Broker-Dealers	$ 42,167.9	$ 40,566.8
Investment Owned, at Fair Value	362.9
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities	76.3
Good Faith and Margin Deposits with Broker-Dealers	17,574.8
Investment Owned, at Fair Value	383.2
Total Assets at Fair Value	18,034.3
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	19.1
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	56.7
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	75.9
Good Faith and Margin Deposits with Broker-Dealers	17,574.8
Investment Owned, at Fair Value	383.2
Total Assets at Fair Value	18,033.9
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	19.1
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	56.7
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 ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Contingent consideration at Fair Value	$ 17.8
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	$ 0.1

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements Narrative (Detail) (Details)	6 Months Ended
	Jun. 30, 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 40

Fair Value Measurements Fair Value of Debt Instruments (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
$750.0 Million Fixed Rate Notes Due March 2043, Interest Equal To 5.3% [Member]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Maturity Date	Sep. 1, 2043
Debt Instrument, Interest Rate, Stated Percentage	5.30%
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00%
Debt Instrument, Face Amount	$ 750
Debt Instrument, Maturity Date	Mar. 1, 2025
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	Sep. 1, 2022
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	Mar. 1, 2018
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	$ 825.8
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	727.9
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	$ 752.1

Earnings Per Share Anti-Dilutiv

Earnings Per Share Anti-Dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	464	1,480	467	1,480
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	456	1,480	456	1,480
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8	0	11	0

Earnings Per Share (Net Income

Earnings Per Share (Net Income Attributable To CME Group) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Income Attributable to CME Group	$ 265	$ 263.8	$ 595.4	$ 530.6
Basic (in shares)	336,036	334,097	335,859	334,002
Dilutive Securities, Effect on EPS	1,760	1,703	1,715	1,703
Diluted (in shares)	337,796	335,800	337,574	335,705
Earnings per common share, basic (in dollars per share)	$ 0.79	$ 0.79	$ 1.77	$ 1.59
Earnings per common share, diluted (in dollars per share)	$ 0.78	$ 0.79	$ 1.76	$ 1.58
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Income Attributable to CME Group			$ 595.4	$ 530.6