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 |