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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total Revenues $ 1,337.8 $ 1,227.8 $ 4,139.6 $ 3,811.6
Services transferred at a point in time [Member]        
Revenues 1,060.3 977.1 3,330.9 3,084.7
Services transferred over time [Member]        
Revenues 272.8 245.1 794.8 711.9
One-time charges and miscellaneous revenues [Member]        
Revenues 4.7 5.6 13.9 15.0
Clearing and transaction fees [Member]        
Revenues 1,085.5 998.6 3,404.0 3,161.3
Total Revenues 1,085.5 998.6 3,404.0 3,161.3
Clearing and transaction fees [Member] | Interest rate [Member]        
Revenues 350.9 317.8 1,148.5 1,017.3
Clearing and transaction fees [Member] | Equities [Member]        
Revenues 250.1 249.7 767.6 764.7
Clearing and transaction fees [Member] | Foreign Exchange [Member]        
Revenues 46.9 50.8 138.9 140.8
Clearing and transaction fees [Member] | Agricultural commodity [Member]        
Revenues 119.9 104.4 382.6 344.7
Clearing and transaction fees [Member] | Energy [Member]        
Revenues 177.4 134.0 521.1 449.4
Clearing and transaction fees [Member] | Metal [Member]        
Revenues 49.6 48.4 166.9 148.0
Clearing and transaction fees [Member] | Interest Rate Swap [Member]        
Revenues 21.2 16.4 64.0 50.7
Clearing and transaction fees [Member] | BrokerTec Fixed Income        
Revenues 37.3 40.7 114.4 127.1
Clearing and transaction fees [Member] | EBS Foreign Exchange        
Revenues 32.2 36.4 100.0 118.6
Market data and information services        
Revenues 167.6 154.3 496.5 457.7
Total Revenues 167.6 154.3 496.5 457.7
Other        
Revenues 84.7 74.9 239.1 192.6
Total Revenues $ 84.7 $ 74.9 $ 239.1 $ 192.6