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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Total Revenues	$ 1,537.6	$ 1,584.4	$ 4,871.9	$ 4,604.8
Services transferred at a point in time [Member]
Revenues	1,201.1	1,270.0	3,871.9	3,677.5
Services transferred over time [Member]
Revenues	331.3	309.5	984.2	912.2
One-time charges and miscellaneous revenues [Member]
Revenues	5.2	4.9	15.8	15.1
Clearing and transaction fees [Member]
Revenues	1,227.9	1,297.1	3,953.2	3,755.9
Total Revenues	1,227.9	1,297.1	3,953.2	3,755.9
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	417.2	445.8	1,315.0	1,249.1
Clearing and transaction fees [Member] | Equities [Member]
Revenues	261.9	291.8	867.7	828.1
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	44.9	51.9	150.7	150.2
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	155.9	139.1	495.0	432.5
Clearing and transaction fees [Member] | Energy [Member]
Revenues	178.3	204.9	612.1	601.0
Clearing and transaction fees [Member] | Metal [Member]
Revenues	79.4	71.8	235.4	218.4
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	20.5	23.3	61.9	68.7
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	39.3	33.3	112.2	108.9
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	30.5	35.2	103.2	99.0
Market data and information services
Revenues	202.5	178.2	595.1	528.6
Total Revenues	202.5	178.2	595.1	528.6
Other
Revenues	107.2	109.1	323.6	320.3
Total Revenues	$ 107.2	$ 109.1	$ 323.6	$ 320.3

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