CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Clearing and transaction fees	$ 3,098.6	$ 3,036.4	$ 2,783.9
Market data and information services	391.8	406.5	399.4
Access and communication fees	100.8	91.4	86.1
Other	53.5	60.9	57.4
Total Revenues	3,644.7	3,595.2	3,326.8
Expenses
Compensation and benefits	562.5	541.0	553.7
Communications	24.3	26.8	27.8
Technology support services	77.3	70.8	64.5
Professional fees and outside services	117.6	144.4	122.8
Amortization of purchased intangibles	95.5	96.1	99.4
Depreciation and amortization	113.0	129.2	129.2
Occupancy and building operations	80.2	86.7	92.5
Licensing and other fee agreements	146.3	135.8	123.8
Other	116.0	161.7	124.4
Total Expenses	1,332.7	1,392.5	1,338.1
Operating Income	2,312.0	2,202.7	1,988.7
Non-Operating Income (Expense)
Investment income	531.7	141.8	30.1
Gains (losses) on derivative investments	0.0	0.0	(1.8)
Interest and other borrowing costs	(117.0)	(123.5)	(117.4)
Equity in net (gains) losses of unconsolidated subsidiaries	129.2	110.2	100.0
Other income (expense)	(329.6)	(43.6)	(42.8)
Total Non-Operating	214.3	84.9	(31.9)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	2,526.3	2,287.6	1,956.8
Income tax provision	(1,537.1)	753.5	709.8
Net Income	$ 4,063.4	$ 1,534.1	$ 1,247.0
Earnings per Common Share Attributable to CME Group:
Basic	$ 12.00	$ 4.55	$ 3.71
Diluted	$ 11.94	$ 4.53	$ 3.69
Weighted Average Number of Common Shares:
Basic	338,707	337,496	336,224
Diluted	340,226	338,966	337,894