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Intangible Assets and Goodwill (Goodwill Activity) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Total Goodwill, beginning balance $ 7,569.0 $ 7,569.0
Business Combinations 0.0 0.0
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Other Activity 0.0 0.0
Total Goodwill, ending balance 7,569.0 7,569.0
CBOT holdings [Member]    
Total Goodwill, beginning balance 5,066.4 5,035.7
Business Combinations 0.0 0.0
Goodwill, Transfers 0.0 30.7
Other Activity 0.0 0.0
Total Goodwill, ending balance 5,066.4 5,066.4
NYMEX holdings [Member]    
Total Goodwill, beginning balance 2,462.2 2,462.2
Business Combinations 0.0 0.0
Goodwill, Written off Related to Sale of Business Unit 0.0 0.0
Other Activity 0.0 0.0
Total Goodwill, ending balance 2,462.2 2,462.2
Other Affiliates [Member]    
Total Goodwill, beginning balance 40.4 71.1
Business Combinations 0.0 0.0
Goodwill, Transfers 0.0 (30.7)
Other Activity 0.0 0.0
Total Goodwill, ending balance $ 40.4 $ 40.4