Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Clearing and transaction fees	$ 715.0	$ 641.8	$ 2,105.0	$ 1,903.3
Market data and information services	99.5	87.7	300.3	266.7
Access and communication fees	21.6	20.8	64.4	61.6
Other	14.2	12.1	43.3	39.8
Total Revenues	850.3	762.4	2,513.0	2,271.4
Expenses
Compensation and benefits	136.4	132.1	419.2	407.3
Communications	7.1	7.8	21.3	24.3
Technology support services	15.4	13.8	47.1	42.3
Professional fees and outside services	33.8	32.2	90.6	99.3
Amortization of purchased intangibles	24.9	25.3	74.8	75.7
Depreciation and amortization	32.4	32.7	97.5	101.1
Occupancy and building operations	23.1	24.7	69.4	71.1
Licensing and other fee agreements	33.1	25.5	92.5	80.2
Other	27.7	37.9	81.8	73.2
Total Expenses	333.9	332.0	994.2	974.5
Operating Income	516.4	430.4	1,518.8	1,296.9
Non-Operating Income (Expense)
Investment income	2.5	7.4	26.7	25.7
Gain (Loss) on Derivative Instruments, Net, Pretax	0.0	0.0	(1.8)	0.0
Interest and other borrowing costs	(28.3)	(28.7)	(88.5)	(90.7)
Equity in net losses of unconsolidated subsidiaries	26.6	20.0	75.1	63.9
Other non-operating income (expense)	(0.8)	0.0	(42.0)	1.8
Total Non-Operating	0.0	(1.3)	(30.5)	0.7
Income before Income Taxes	516.4	429.1	1,488.3	1,297.6
Income tax provision	156.5	139.1	533.0	477.2
Net income	359.9	290.0	955.3	820.4
Net Income (Loss) Attributable to Noncontrolling Interest	0.0	0.0	0.0	(0.2)
Net Income Attributable to CME Group	$ 359.9	$ 290.0	$ 955.3	$ 820.6
Earnings per Common Share Attributable to CME Group:
Basic (in dollars per share)	$ 1.07	$ 0.87	$ 2.84	$ 2.46
Diluted (in dollars per share)	$ 1.06	$ 0.86	$ 2.83	$ 2.44
Weighted Average Number of Common Shares:
Basic (in shares)	336,323	334,424	336,015	334,144
Diluted (in shares)	338,139	336,172	337,804	335,820