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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total Revenues $ 1,360.2 $ 1,237.2 $ 2,801.8 $ 2,583.8
Services transferred at a point in time [Member]        
Revenues 1,093.1 965.8 2,270.6 2,043.1
Services transferred over time [Member]        
Revenues 262.5 266.6 522.0 531.3
One-time charges and miscellaneous revenues [Member]        
Revenues 4.6 4.8 9.2 9.4
Clearing and transaction fees [Member]        
Revenues 1,118.3 1,024.6 2,318.5 2,162.7
Total Revenues 1,118.3 1,024.6 2,318.5 2,162.7
Clearing and transaction fees [Member] | Interest rate [Member]        
Revenues 352.9 324.6 797.7 699.5
Clearing and transaction fees [Member] | Equities [Member]        
Revenues 248.3 255.9 517.5 515.0
Clearing and transaction fees [Member] | Foreign Exchange [Member]        
Revenues 44.5 45.2 92.0 90.0
Clearing and transaction fees [Member] | Agricultural commodity [Member]        
Revenues 147.4 114.3 262.7 240.3
Clearing and transaction fees [Member] | Energy [Member]        
Revenues 175.8 140.2 343.7 315.4
Clearing and transaction fees [Member] | Metal [Member]        
Revenues 56.4 45.2 117.3 99.6
Clearing and transaction fees [Member] | Interest Rate Swap [Member]        
Revenues 23.1 17.3 42.7 34.3
Clearing and transaction fees [Member] | BrokerTec Fixed Income        
Revenues 37.9 42.1 77.1 86.4
Clearing and transaction fees [Member] | EBS Foreign Exchange        
Revenues 32.0 39.8 67.8 82.2
Market data and information services        
Revenues 163.1 151.7 328.9 303.4
Total Revenues 163.1 151.7 328.9 303.4
Other        
Revenues 78.8 60.9 154.4 117.7
Total Revenues $ 78.8 $ 60.9 $ 154.4 $ 117.7