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Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total Revenues	$ 5,578.9	$ 5,019.4	$ 4,689.7
Clearing and Transaction Fees [Member]
Revenue	4,588.5	4,142.7	3,765.1
Total Revenues	4,588.5	4,142.7	3,765.1
MarketData [Member]
Revenue	663.7	610.9	576.9
Total Revenues	663.7	610.9	576.9
OtherRevenue [Member]
Revenue	326.7	265.8	347.7
Total Revenues	326.7	265.8	347.7
Interest Rate [Member] | Clearing and Transaction Fees [Member]
Revenue	1,558.4	1,326.8	1,121.9
Equities [Member] | Clearing and Transaction Fees [Member]
Revenue	1,036.4	1,016.3	752.1
Foreign Exchange [Member] | Clearing and Transaction Fees [Member]
Revenue	190.0	188.3	159.2
Agricultural commodity [Member] | Clearing and Transaction Fees [Member]
Revenue	508.5	444.7	457.8
Energy [Member] | Clearing and Transaction Fees [Member]
Revenue	702.8	585.5	616.5
Metal [Member] | Clearing and Transaction Fees [Member]
Revenue	224.7	196.9	198.8
Over the Counter [Member] | Clearing and Transaction Fees [Member]
Revenue	83.0	65.4	62.6
BrokerTec Fixed Income | Clearing and Transaction Fees [Member]
Revenue	152.1	164.7	172.0
EBS Foreign Exchange | Clearing and Transaction Fees [Member]
Revenue	132.6	154.1	164.3
Optimization | Clearing and Transaction Fees [Member]
Revenue	0.0	0.0	59.9
Transferred at Point in Time [Member]
Revenue	4,491.1	4,044.3	3,656.6
Transferred over Time [Member]
Revenue	1,069.7	955.3	1,021.5
One-time charges and miscellaneous revenues [Member]
Revenue	$ 18.1	$ 19.8	$ 11.6

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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