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Performance Bonds and Guaranty Fund Contributions (Cash and Securities Held as Performance Bonds and Guaranty Fund Contributions at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Performance collateral for delivery $ 1,759.8 $ 1,208.0
Total 37,543.5 35,553.0
Cash [Member]    
Performance bonds 35,726.5 33,592.8
Guaranty Fund Contributions 1,702.4 1,919.2
Cross-margin arrangements 107.9 37.8
Performance collateral for delivery 6.7 3.2
Total 37,543.5 35,553.0
Non-Cash Deposits and IEF Funds [Member]    
Performance bonds 111,764.2 91,954.4
Guaranty Fund Contributions 5,246.3 5,290.0
Cross-margin arrangements 351.3 163.7
Performance collateral for delivery 0.0 0.0
Total $ 117,361.8 $ 97,408.1