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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Total Revenues	$ 1,532.5	$ 1,360.2	$ 3,020.4	$ 2,801.8
Services transferred at a point in time [Member]
Revenues	1,223.6	1,093.1	2,407.5	2,270.6
Services transferred over time [Member]
Revenues	303.2	262.5	602.7	522.0
One-time charges and miscellaneous revenues [Member]
Revenues	5.7	4.6	10.2	9.2
Clearing and transaction fees [Member]
Revenues	1,249.9	1,118.3	2,458.8	2,318.5
Total Revenues	1,249.9	1,118.3	2,458.8	2,318.5
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	393.0	352.9	803.3	797.7
Clearing and transaction fees [Member] | Equities [Member]
Revenues	268.2	248.3	536.3	517.5
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	51.1	44.5	98.3	92.0
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	161.4	147.4	293.4	262.7
Clearing and transaction fees [Member] | Energy [Member]
Revenues	199.9	175.8	396.1	343.7
Clearing and transaction fees [Member] | Metal [Member]
Revenues	82.6	56.4	146.6	117.3
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	23.3	23.1	45.4	42.7
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	37.9	37.9	75.6	77.1
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	32.5	32.0	63.8	67.8
Market data and information services
Revenues	175.0	163.1	350.4	328.9
Total Revenues	175.0	163.1	350.4	328.9
Other
Revenues	107.6	78.8	211.2	154.4
Total Revenues	$ 107.6	$ 78.8	$ 211.2	$ 154.4

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