Consolidated Statements Of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Clearing and transaction fees	$ 641.8	$ 597.9	$ 1,903.3	$ 1,883.6
Market data and information services	87.7	78.6	266.7	238.9
Access and communication fees	20.8	20.3	61.6	62.4
Other	12.1	17.8	39.8	64.4
Total Revenues	762.4	714.6	2,271.4	2,249.3
Expenses
Compensation and benefits	132.1	134.0	407.3	392.3
Communications	7.8	9.2	24.3	26.7
Technology support services	13.8	13.4	42.3	39.6
Professional fees and outside services	32.2	35.6	99.3	85.4
Amortization of purchased intangibles	25.3	25.6	75.7	77.4
Depreciation and amortization	32.7	35.0	101.1	100.8
Occupancy and building operations	24.7	19.2	71.1	56.7
Licensing and other fee agreements	25.5	25.7	80.2	73.8
Other	37.9	16.4	73.2	82.8
Total Expenses	332.0	314.1	974.5	935.5
Operating Income	430.4	400.5	1,296.9	1,313.8
Non-Operating Income (Expense)
Investment income	7.4	12.6	25.7	34.9
Interest and other borrowing costs	(28.7)	(34.6)	(90.7)	(112.8)
Equity in net losses of unconsolidated subsidiaries	20.0	20.4	63.9	58.1
Other non-operating income (expense)	0	0	1.8	0
Total Non-Operating	(1.3)	(1.6)	0.7	(19.8)
Income before Income Taxes	429.1	398.9	1,297.6	1,294.0
Income tax provision	139.1	162.6	477.2	509.0
Net income	290.0	236.3	820.4	785.0
Net Income (Loss) Attributable to Noncontrolling Interest	0	(0.4)	(0.2)	1.3
Net Income Attributable to CME Group	$ 290.0	$ 236.7	$ 820.6	$ 783.7
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,161	1,540	2,163	2,417
Earnings per Common Share Attributable to CME Group:
Basic (in dollars per share)	$ 0.87	$ 0.71	$ 2.46	$ 2.36
Diluted (in dollars per share)	$ 0.86	$ 0.71	$ 2.44	$ 2.35
Weighted Average Number of Common Shares:
Basic (in shares)	334,424	332,763	334,144	332,355
Diluted (in shares)	336,172	334,674	335,820	334,055