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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total Revenues $ 1,179.2 $ 1,182.3 $ 2,432.5 $ 2,704.4
Services transferred at a point in time [Member]        
Revenues 870.1 881.3 1,815.4 2,092.5
Services transferred over time [Member]        
Revenues 303.7 298.8 609.8 606.3
One-time charges and miscellaneous revenues [Member]        
Revenues 5.4 2.2 7.3 5.6
Clearing and transaction fees [Member]        
Revenues 929.9 940.2 1,936.9 2,219.0
Total Revenues 929.9 940.2 1,936.9 2,219.0
Clearing and transaction fees [Member] | Interest rate [Member]        
Revenues 265.5 221.4 565.2 639.7
Clearing and transaction fees [Member] | Equities [Member]        
Revenues 172.3 201.3 370.8 449.5
Clearing and transaction fees [Member] | Foreign Exchange [Member]        
Revenues 39.0 35.9 79.5 84.1
Clearing and transaction fees [Member] | Agricultural commodity [Member]        
Revenues 138.0 108.7 258.5 226.4
Clearing and transaction fees [Member] | Energy [Member]        
Revenues 141.0 194.0 299.1 415.8
Clearing and transaction fees [Member] | Metal [Member]        
Revenues 51.5 49.6 109.8 128.4
Clearing and transaction fees [Member] | Cash Markets [Member]        
Revenues 105.7 112.4 220.9 236.8
Clearing and transaction fees [Member] | Interest Rate Swap [Member]        
Revenues 16.9 16.9 33.1 38.3
Market data and information services        
Revenues 145.2 134.7 289.4 266.2
Total Revenues 145.2 134.7 289.4 266.2
Other        
Revenues 104.1 107.4 206.2 219.2
Total Revenues $ 104.1 $ 107.4 $ 206.2 $ 219.2