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Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total Revenues	$ 5,019.4	$ 4,689.7	$ 4,883.6
Deferred Revenue	12.7	15.2
Clearing and Transaction Fees [Member]
Total Revenues	4,142.7	3,765.1	3,897.4
Revenue	4,142.7	3,765.1	3,897.4
MarketData [Member]
Total Revenues	610.9	576.9	545.4
Revenue	610.9	576.9	545.4
OtherRevenue [Member]
Total Revenues	265.8	347.7	440.8
Revenue	265.8	347.7	440.8
Interest Rate [Member] | Clearing and Transaction Fees [Member]
Revenue	1,326.8	1,121.9	1,008.1
Equities [Member] | Clearing and Transaction Fees [Member]
Revenue	1,016.3	752.1	803.7
Foreign Exchange [Member] | Clearing and Transaction Fees [Member]
Revenue	188.3	159.2	163.3
Agricultural commodity [Member] | Clearing and Transaction Fees [Member]
Revenue	444.7	457.8	462.2
Energy [Member] | Clearing and Transaction Fees [Member]
Revenue	585.5	616.5	699.3
Metal [Member] | Clearing and Transaction Fees [Member]
Revenue	196.9	198.8	248.0
Over the Counter [Member] | Clearing and Transaction Fees [Member]
Revenue	65.4	62.6	65.4
BrokerTec Fixed Income | Clearing and Transaction Fees [Member]
Revenue	164.7	172.0	173.3
EBS Foreign Exchange | Clearing and Transaction Fees [Member]
Revenue	154.1	164.3	179.3
Optimization | Clearing and Transaction Fees [Member]
Revenue	0.0	59.9	94.8
Transferred at Point in Time [Member]
Revenue	4,044.3	3,656.6	3,785.6
Transferred over Time [Member]
Revenue	955.3	1,021.5	1,091.8
One-time charges and miscellaneous revenues [Member]
Revenue	$ 19.8	$ 11.6	$ 6.2

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