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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Total Revenues	$ 1,692.0	$ 1,532.5	$ 3,334.3	$ 3,020.4
Services transferred at a point in time [Member]
Revenues	1,361.7	1,223.6	2,670.8	2,407.5
Services transferred over time [Member]
Revenues	324.7	303.2	652.9	602.7
One-time charges and miscellaneous revenues [Member]
Revenues	5.6	5.7	10.6	10.2
Clearing and transaction fees [Member]
Revenues	1,388.0	1,249.9	2,725.3	2,458.8
Total Revenues	1,388.0	1,249.9	2,725.3	2,458.8
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	461.6	393.0	897.9	803.3
Clearing and transaction fees [Member] | Equities [Member]
Revenues	301.6	268.2	605.8	536.3
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	52.4	51.1	105.8	98.3
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	174.7	161.4	339.0	293.4
Clearing and transaction fees [Member] | Energy [Member]
Revenues	217.4	199.9	433.8	396.1
Clearing and transaction fees [Member] | Metal [Member]
Revenues	85.1	82.6	156.0	146.6
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	20.6	23.3	41.4	45.4
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	37.1	37.9	72.9	75.6
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	37.5	32.5	72.7	63.8
Market data and information services
Revenues	198.1	175.0	392.6	350.4
Total Revenues	198.1	175.0	392.6	350.4
Other
Revenues	105.9	107.6	216.4	211.2
Total Revenues	$ 105.9	$ 107.6	$ 216.4	$ 211.2

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