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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total Revenues	$ 1,227.8	$ 1,109.9	$ 3,811.6	$ 3,542.4
Services transferred at a point in time [Member]
Revenues	977.1	852.4	3,084.7	2,733.5
Services transferred over time [Member]
Revenues	245.1	255.3	711.9	798.2
One-time charges and miscellaneous revenues [Member]
Revenues	5.6	2.2	15.0	10.7
Clearing and transaction fees [Member]
Revenues	998.6	878.9	3,161.3	2,815.8
Total Revenues	998.6	878.9	3,161.3	2,815.8
Clearing and transaction fees [Member] | Interest rate [Member]
Revenues	317.8	251.0	1,017.3	816.2
Clearing and transaction fees [Member] | Equities [Member]
Revenues	249.7	181.1	764.7	551.9
Clearing and transaction fees [Member] | Foreign Exchange [Member]
Revenues	50.8	39.8	140.8	119.3
Clearing and transaction fees [Member] | Agricultural commodity [Member]
Revenues	104.4	96.3	344.7	354.8
Clearing and transaction fees [Member] | Energy [Member]
Revenues	134.0	157.1	449.4	456.2
Clearing and transaction fees [Member] | Metal [Member]
Revenues	48.4	45.0	148.0	154.8
Clearing and transaction fees [Member] | Interest Rate Swap [Member]
Revenues	16.4	15.1	50.7	48.2
Clearing and transaction fees [Member] | BrokerTec Fixed Income
Revenues	40.7	40.7	127.1	129.0
Clearing and transaction fees [Member] | EBS Foreign Exchange
Revenues	36.4	38.8	118.6	125.5
Clearing and transaction fees [Member] | Optimization
Revenues	0.0	14.0	0.0	59.9
Market data and information services
Revenues	154.3	145.4	457.7	434.8
Total Revenues	154.3	145.4	457.7	434.8
Other
Revenues	74.9	85.6	192.6	291.8
Total Revenues	$ 74.9	$ 85.6	$ 192.6	$ 291.8

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