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REVENUE RECOGNITION - Revenue by product line and segment (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
item
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information      
Number of reportable segments | segment 6    
Number of types of regulatory fees the Company recognizes | item 2    
Revenues $ 4,094.5 $ 3,773.5 $ 3,958.5
Services transferred at a point in time      
Segment Reporting Information      
Revenues 3,429.9 3,132.3 3,352.1
Services transferred over time      
Segment Reporting Information      
Revenues 664.6 641.2 606.4
Options | Operating Segments      
Segment Reporting Information      
Revenues 2,002.6 1,939.5 1,823.2
Options | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 1,710.4 1,659.7 1,562.8
Options | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 292.2 279.8 260.4
North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 1,546.8 1,353.0 1,681.7
North American Equities | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 1,298.3 1,107.6 1,441.2
North American Equities | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 248.5 245.4 240.5
Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 324.2 281.2 264.6
Europe and Asia Pacific | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 244.5 208.2 197.5
Europe and Asia Pacific | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 79.7 73.0 67.1
Futures | Operating Segments      
Segment Reporting Information      
Revenues 141.1 129.0 119.8
Futures | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 109.4 98.5 91.9
Futures | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 31.7 30.5 27.9
Global FX | Operating Segments      
Segment Reporting Information      
Revenues 79.9 74.9 68.9
Global FX | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 67.4 62.8 58.4
Global FX | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 12.5 12.1 10.5
Digital | Operating Segments      
Segment Reporting Information      
Revenues (0.1) (4.1) 0.3
Digital | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues (0.1) (4.5) 0.3
Digital | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 0.0 0.4 0.0
Transaction and clearing fees      
Segment Reporting Information      
Revenues 2,904.6 2,831.3 2,938.8
Transaction and clearing fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 1,599.0 1,583.7 1,471.7
Transaction and clearing fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 970.5 946.3 1,155.3
Transaction and clearing fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 159.6 145.6 161.9
Transaction and clearing fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 109.2 98.0 91.6
Transaction and clearing fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 66.6 62.2 58.0
Transaction and clearing fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues (0.3) (4.5) 0.3
Access and capacity fees      
Segment Reporting Information      
Revenues 369.8 347.5 324.2
Access and capacity fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 168.4 161.0 151.7
Access and capacity fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 127.7 117.1 109.3
Access and capacity fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 40.3 36.3 34.0
Access and capacity fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 22.4 22.0 19.9
Access and capacity fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 11.0 10.7 9.3
Access and capacity fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.4 0.0
Market data fees      
Segment Reporting Information      
Revenues 294.8 293.7 282.2
Market data fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 123.8 118.8 108.7
Market data fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 120.8 128.3 131.2
Market data fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 39.4 36.7 33.1
Market data fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 9.3 8.5 8.0
Market data fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 1.5 1.4 1.2
Market data fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees      
Segment Reporting Information      
Revenues 426.3 223.7 364.7
Regulatory fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 105.9 69.6 84.2
Regulatory fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 320.2 153.8 280.2
Regulatory fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 0.2 0.3 0.3
Regulatory fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Other revenue      
Segment Reporting Information      
Revenues 99.0 77.3 48.6
Other revenue | Options | Operating Segments      
Segment Reporting Information      
Revenues 5.5 6.4 6.9
Other revenue | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 7.6 7.5 5.7
Other revenue | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 84.9 62.6 35.6
Other revenue | Futures | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.2 0.0
Other revenue | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 0.8 0.6 0.4
Other revenue | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.2 0.0 0.0
Cash and spot markets      
Segment Reporting Information      
Revenues 1,670.0 1,445.1 1,777.6
Cash and spot markets | Transaction and clearing fees      
Segment Reporting Information      
Revenues 1,196.3 1,149.7 1,375.5
Cash and spot markets | Access and capacity fees      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Cash and spot markets | Market data fees      
Segment Reporting Information      
Revenues 60.4 71.3 80.3
Cash and spot markets | Regulatory fees      
Segment Reporting Information      
Revenues 320.2 153.8 280.2
Cash and spot markets | Other revenue      
Segment Reporting Information      
Revenues 93.1 70.3 41.6
Data Vantage      
Segment Reporting Information      
Revenues 576.6 539.2 497.0
Data Vantage | Transaction and clearing fees      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Data Vantage | Access and capacity fees      
Segment Reporting Information      
Revenues 369.8 347.5 324.2
Data Vantage | Market data fees      
Segment Reporting Information      
Revenues 203.9 188.7 168.7
Data Vantage | Regulatory fees      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Data Vantage | Other revenue      
Segment Reporting Information      
Revenues 2.9 3.0 4.1
Derivatives markets      
Segment Reporting Information      
Revenues 1,847.9 1,789.2 1,683.9
Derivatives markets | Transaction and clearing fees      
Segment Reporting Information      
Revenues 1,708.3 1,681.6 1,563.3
Derivatives markets | Access and capacity fees      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Derivatives markets | Market data fees      
Segment Reporting Information      
Revenues 30.5 33.7 33.2
Derivatives markets | Regulatory fees      
Segment Reporting Information      
Revenues 106.1 69.9 84.5
Derivatives markets | Other revenue      
Segment Reporting Information      
Revenues $ 3.0 $ 4.0 $ 2.9