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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Total Revenues	$ 1,642.3	$ 1,487.9
Services transferred at a point in time [Member]
Revenues	1,309.1	1,183.9
Services transferred over time [Member]
Revenues	328.2	299.5
One-time charges and miscellaneous revenues [Member]
Revenues	5.0	4.5
Clearing and transaction fees [Member]
Revenues	1,337.3	1,208.9
Total Revenues	1,337.3	1,208.9
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	436.3	410.3
Clearing and transaction fees [Member] | Equities [Member]
Revenues	304.2	268.1
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	53.4	47.2
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	164.3	132.0
Clearing and transaction fees [Member] | Energy [Member]
Revenues	216.4	196.2
Clearing and transaction fees [Member] | Metal [Member]
Revenues	70.9	64.0
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	20.8	22.0
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	35.9	37.8
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	35.1	31.3
Market data and information services
Revenues	194.5	175.4
Total Revenues	194.5	175.4
Other
Revenues	110.5	103.6
Total Revenues	$ 110.5	$ 103.6

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