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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total Revenues $ 1,179.6 $ 1,109.0
Services transferred at a point in time [Member]    
Revenues 892.9 957.7
Services transferred over time [Member]    
Revenues 277.7 148.8
One-time charges and miscellaneous revenues [Member]    
Revenues 9.0 2.5
Clearing and transaction fees [Member]    
Revenues 952.6 973.6
Clearing and transaction fees [Member] | Interest rate [Member]    
Revenues 302.8 338.4
Clearing and transaction fees [Member] | Equities [Member]    
Revenues 145.9 195.0
Clearing and transaction fees [Member] | Foreign Exchange [Member]    
Revenues 41.2 51.1
Clearing and transaction fees [Member] | Agricultural commodity [Member]    
Revenues 105.0 121.1
Clearing and transaction fees [Member] | Energy [Member]    
Revenues 165.0 191.5
Clearing and transaction fees [Member] | Metal [Member]    
Revenues 51.0 59.4
Clearing and transaction fees [Member] | Cash Markets [Member]    
Revenues 122.9 0.0
Clearing and transaction fees [Member] | Interest rate swap [Member]    
Revenues 18.8 17.1
Market data and information services    
Revenues 130.1 94.9
Other    
Revenues $ 96.9 $ 40.5