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Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Total Revenues	$ 6,130.1	$ 5,578.9	$ 5,019.4
Clearing and Transaction Fees [Member]
Revenue	4,988.2	4,588.5	4,142.7
Total Revenues	4,988.2	4,588.5	4,142.7
MarketData [Member]
Revenue	710.2	663.7	610.9
Total Revenues	710.2	663.7	610.9
OtherRevenue [Member]
Revenue	431.7	326.7	265.8
Total Revenues	431.7	326.7	265.8
Interest Rate [Member] | Clearing and Transaction Fees [Member]
Revenue	1,659.6	1,558.4	1,326.8
Equities [Member] | Clearing and Transaction Fees [Member]
Revenue	1,095.3	1,036.4	1,016.3
Foreign Exchange [Member] | Clearing and Transaction Fees [Member]
Revenue	198.5	190.0	188.3
Agricultural commodity [Member] | Clearing and Transaction Fees [Member]
Revenue	585.1	508.5	444.7
Energy [Member] | Clearing and Transaction Fees [Member]
Revenue	800.5	702.8	585.5
Metal [Member] | Clearing and Transaction Fees [Member]
Revenue	284.3	224.7	196.9
Over the Counter [Member] | Clearing and Transaction Fees [Member]
Revenue	88.2	83.0	65.4
BrokerTec Fixed Income | Clearing and Transaction Fees [Member]
Revenue	145.1	152.1	164.7
EBS Foreign Exchange | Clearing and Transaction Fees [Member]
Revenue	131.6	132.6	154.1
Transferred at Point in Time [Member]
Revenue	4,887.4	4,491.1	4,044.3
Transferred over Time [Member]
Revenue	1,223.0	1,069.7	955.3
One-time charges and miscellaneous revenues [Member]
Revenue	$ 19.7	$ 18.1	$ 19.8

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