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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income attributable to CME Group $ 193.1 $ 236.7 $ 311.2 $ 235.8 $ 166.8 $ 218.0 $ 244.9 $ 266.6 $ 976.8 $ 896.3 $ 1,812.3
Basic                 332,678 331,252 332,737
Dilutive Securities, Effect on EPS                 1,720 1,067 1,074
Diluted                 334,398 332,319 333,811
Earnings per common share, basic $ 0.58 $ 0.71 $ 0.94 $ 0.71 $ 0.50 $ 0.66 $ 0.74 $ 0.81 $ 2.94 $ 2.71 $ 5.45
Earnings per common share, diluted $ 0.58 $ 0.71 $ 0.93 $ 0.71 $ 0.50 $ 0.66 $ 0.74 $ 0.80 $ 2.92 $ 2.70 $ 5.43
Outstanding anti-dilutive options                 1,631 4,851 4,689
Stock Options [Member]
                     
Outstanding anti-dilutive options                 1,566 4,851 4,689
Restricted Stock [Member]
                     
Outstanding anti-dilutive options                 65 0 0