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Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total Revenues	$ 4,689.7	$ 4,883.6	$ 4,868.0
Deferred Revenue	15.2	37.3
Clearing and Transaction Fees [Member]
Total Revenues	3,765.1	3,897.4	3,946.1
Revenue	3,765.1	3,897.4	3,946.1
MarketData [Member]
Total Revenues	576.9	545.4	518.5
Revenue	576.9	545.4	518.5
OtherRevenue [Member]
Total Revenues	347.7	440.8	403.4
Revenue	347.7	440.8	403.4
Interest Rate [Member] | Clearing and Transaction Fees [Member]
Revenue	1,121.9	1,008.1	1,278.5
Equities [Member] | Clearing and Transaction Fees [Member]
Revenue	752.1	803.7	583.8
Foreign Exchange [Member] | Clearing and Transaction Fees [Member]
Revenue	159.2	163.3	158.8
Agricultural commodity [Member] | Clearing and Transaction Fees [Member]
Revenue	457.8	462.2	452.4
Energy [Member] | Clearing and Transaction Fees [Member]
Revenue	616.5	699.3	683.5
Metal [Member] | Clearing and Transaction Fees [Member]
Revenue	198.8	248.0	239.3
Over the Counter [Member] | Clearing and Transaction Fees [Member]
Revenue	62.6	65.4	66.8
Cash Markets [Member] | Clearing and Transaction Fees [Member]
Revenue	396.2	447.4	483.0
Transferred at Point in Time [Member]
Revenue	3,528.1	3,658.2	3,696.2
Transferred over Time [Member]
Revenue	1,150.0	1,219.2	1,156.9
One-time charges and miscellaneous revenues [Member]
Revenue	$ 11.6	$ 6.2	$ 14.9

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