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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenue Recognition [Abstract]
Deferred Revenue	$ 69.6		$ 16.7
Disaggregation of Revenue [Line Items]
Total Revenues	1,880.1	$ 1,642.3
Services transferred at a point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,517.0	1,309.1
Services transferred over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	357.3	328.2
One-time charges and miscellaneous revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	5.8	5.0
Clearing and transaction fees [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,542.6	1,337.3
Total Revenues	1,542.6	1,337.3
Clearing and transaction fees [Member] \| Interest rate [Member]
Disaggregation of Revenue [Line Items]
Revenues	521.2	436.3
Clearing and transaction fees [Member] \| Equities [Member]
Disaggregation of Revenue [Line Items]
Revenues	315.6	304.2
Clearing and transaction fees [Member] \| Foreign Exchange [Member]
Disaggregation of Revenue [Line Items]
Revenues	56.8	53.4
Clearing and transaction fees [Member] \| Agricultural commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues	167.5	164.3
Clearing and transaction fees [Member] \| Energy [Member]
Disaggregation of Revenue [Line Items]
Revenues	263.7	216.4
Clearing and transaction fees [Member] \| Metal [Member]
Disaggregation of Revenue [Line Items]
Revenues	118.4	70.9
Clearing and transaction fees [Member] \| BrokerTec Fixed Income
Disaggregation of Revenue [Line Items]
Revenues	40.2	35.9
Clearing and transaction fees [Member] \| EBS Foreign Exchange
Disaggregation of Revenue [Line Items]
Revenues	36.4	35.1
Clearing and transaction fees [Member] \| Interest Rate Swap [Member]
Disaggregation of Revenue [Line Items]
Revenues	22.8	20.8
Market data and information services
Disaggregation of Revenue [Line Items]
Revenues	224.1	194.5
Total Revenues	224.1	194.5
Other
Disaggregation of Revenue [Line Items]
Revenues	113.4	110.5
Total Revenues	$ 113.4	$ 110.5