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REVENUE RECOGNITION - Schedule of revenue by product line and Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) item	Mar. 31, 2020 USD ($)
Segment Reporting Information
Number of types of regulatory fees the Company recognizes | item	2
Revenues	$ 1,010.8	$ 921.5
Services transferred at a point in time
Segment Reporting Information
Revenues	880.6	807.6
Services transferred over time
Segment Reporting Information
Revenues	130.2	113.9
Corporate Items and Eliminations
Segment Reporting Information
Revenues	0.3
Corporate Items and Eliminations | Services transferred at a point in time
Segment Reporting Information
Revenues	0.3
Options | Operating Segments
Segment Reporting Information
Revenues	382.4	356.5
Options | Operating Segments | Services transferred at a point in time
Segment Reporting Information
Revenues	332.5	312.1
Options | Operating Segments | Services transferred over time
Segment Reporting Information
Revenues	49.9	44.4
North American Equities | Operating Segments
Segment Reporting Information
Revenues	526.0	473.7
North American Equities | Operating Segments | Services transferred at a point in time
Segment Reporting Information
Revenues	465.1	419.7
North American Equities | Operating Segments | Services transferred over time
Segment Reporting Information
Revenues	60.9	54.0
Futures | Operating Segments
Segment Reporting Information
Revenues	31.6	41.5
Futures | Operating Segments | Services transferred at a point in time
Segment Reporting Information
Revenues	25.6	35.9
Futures | Operating Segments | Services transferred over time
Segment Reporting Information
Revenues	6.0	5.6
Europe | Operating Segments
Segment Reporting Information
Revenues	55.8	32.9
Europe | Operating Segments | Services transferred at a point in time
Segment Reporting Information
Revenues	44.7	24.8
Europe | Operating Segments | Services transferred over time
Segment Reporting Information
Revenues	11.1	8.1
Global FX | Operating Segments
Segment Reporting Information
Revenues	14.7	16.9
Global FX | Operating Segments | Services transferred at a point in time
Segment Reporting Information
Revenues	12.4	15.1
Global FX | Operating Segments | Services transferred over time
Segment Reporting Information
Revenues	2.3	1.8
Transaction and clearing fees
Segment Reporting Information
Revenues	763.2	661.5
Transaction and clearing fees | Options | Operating Segments
Segment Reporting Information
Revenues	308.7	284.2
Transaction and clearing fees | North American Equities | Operating Segments
Segment Reporting Information
Revenues	381.8	304.0
Transaction and clearing fees | Futures | Operating Segments
Segment Reporting Information
Revenues	25.6	35.9
Transaction and clearing fees | Europe | Operating Segments
Segment Reporting Information
Revenues	34.7	22.3
Transaction and clearing fees | Global FX | Operating Segments
Segment Reporting Information
Revenues	12.4	15.1
Access and capacity fees
Segment Reporting Information
Revenues	66.4	57.7
Access and capacity fees | Options | Operating Segments
Segment Reporting Information
Revenues	29.4	27.2
Access and capacity fees | North American Equities | Operating Segments
Segment Reporting Information
Revenues	23.4	20.0
Access and capacity fees | Futures | Operating Segments
Segment Reporting Information
Revenues	4.4	4.0
Access and capacity fees | Europe | Operating Segments
Segment Reporting Information
Revenues	7.1	4.9
Access and capacity fees | Global FX | Operating Segments
Segment Reporting Information
Revenues	2.1	1.6
Market data fees
Segment Reporting Information
Revenues	63.8	56.2
Market data fees | Options | Operating Segments
Segment Reporting Information
Revenues	20.5	17.2
Market data fees | North American Equities | Operating Segments
Segment Reporting Information
Revenues	37.5	34.0
Market data fees | Futures | Operating Segments
Segment Reporting Information
Revenues	1.6	1.6
Market data fees | Europe | Operating Segments
Segment Reporting Information
Revenues	4.0	3.2
Market data fees | Global FX | Operating Segments
Segment Reporting Information
Revenues	0.2	0.2
Regulatory fees
Segment Reporting Information
Revenues	101.5	136.8
Regulatory fees | Options | Operating Segments
Segment Reporting Information
Revenues	19.1	22.3
Regulatory fees | North American Equities | Operating Segments
Segment Reporting Information
Revenues	82.4	114.5
Other revenue
Segment Reporting Information
Revenues	15.9	9.3
Other revenue | Corporate Items and Eliminations
Segment Reporting Information
Revenues	0.3
Other revenue | Options | Operating Segments
Segment Reporting Information
Revenues	4.7	5.6
Other revenue | North American Equities | Operating Segments
Segment Reporting Information
Revenues	0.9	1.2
Other revenue | Europe | Operating Segments
Segment Reporting Information
Revenues	$ 10.0	$ 2.5

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