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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Total Revenues	$ 1,584.4	$ 1,337.8	$ 4,604.8	$ 4,139.6
Services transferred at a point in time [Member]
Revenues	1,270.0	1,060.3	3,677.5	3,330.9
Services transferred over time [Member]
Revenues	309.5	272.8	912.2	794.8
One-time charges and miscellaneous revenues [Member]
Revenues	4.9	4.7	15.1	13.9
Clearing and transaction fees [Member]
Revenues	1,297.1	1,085.5	3,755.9	3,404.0
Total Revenues	1,297.1	1,085.5	3,755.9	3,404.0
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	445.8	350.9	1,249.1	1,148.5
Clearing and transaction fees [Member] | Equities [Member]
Revenues	291.8	250.1	828.1	767.6
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	51.9	46.9	150.2	138.9
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	139.1	119.9	432.5	382.6
Clearing and transaction fees [Member] | Energy [Member]
Revenues	204.9	177.4	601.0	521.1
Clearing and transaction fees [Member] | Metal [Member]
Revenues	71.8	49.6	218.4	166.9
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	23.3	21.2	68.7	64.0
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	33.3	37.3	108.9	114.4
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	35.2	32.2	99.0	100.0
Market data and information services
Revenues	178.2	167.6	528.6	496.5
Total Revenues	178.2	167.6	528.6	496.5
Other
Revenues	109.1	84.7	320.3	239.1
Total Revenues	$ 109.1	$ 84.7	$ 320.3	$ 239.1

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