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REVENUE RECOGNITION - Revenue by product line and segment (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
segment
fee_type
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Segment Reporting Information      
Number of reportable segments | segment 5 6  
Number of types of regulatory fees the Company recognizes | fee_type 2    
Revenues $ 4,714.2 $ 4,094.5 $ 3,773.5
Services transferred at a point in time      
Segment Reporting Information      
Revenues 3,978.9 3,429.9 3,132.3
Services transferred over time      
Segment Reporting Information      
Revenues 735.3 664.6 641.2
Options | Operating Segments      
Segment Reporting Information      
Revenues 2,433.6 2,002.6 1,939.5
Options | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 2,106.6 1,710.4 1,659.7
Options | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 327.0 292.2 279.8
North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 1,672.3 1,546.8 1,353.0
North American Equities | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 1,398.2 1,298.3 1,107.6
North American Equities | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 274.1 248.5 245.4
Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 378.6 324.2 281.2
Europe and Asia Pacific | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 289.8 244.5 208.2
Europe and Asia Pacific | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 88.8 79.7 73.0
Futures | Operating Segments      
Segment Reporting Information      
Revenues 135.9 141.1 129.0
Futures | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 103.3 109.4 98.5
Futures | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 32.6 31.7 30.5
Global FX | Operating Segments      
Segment Reporting Information      
Revenues 93.8 79.9 74.9
Global FX | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 81.0 67.4 62.8
Global FX | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 12.8 12.5 12.1
Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 (0.1) (4.1)
Digital | Operating Segments | Services transferred at a point in time      
Segment Reporting Information      
Revenues 0.0 (0.1) (4.5)
Digital | Operating Segments | Services transferred over time      
Segment Reporting Information      
Revenues 0.0 0.0 0.4
Transaction and clearing fees      
Segment Reporting Information      
Revenues 3,597.6 2,904.6 2,831.3
Transaction and clearing fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 2,011.5 1,599.0 1,583.7
Transaction and clearing fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 1,193.3 970.5 946.3
Transaction and clearing fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 209.9 159.6 145.6
Transaction and clearing fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 103.0 109.2 98.0
Transaction and clearing fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 79.9 66.6 62.2
Transaction and clearing fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 (0.3) (4.5)
Access and capacity fees      
Segment Reporting Information      
Revenues 408.7 369.8 347.5
Access and capacity fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 184.8 168.4 161.0
Access and capacity fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 144.4 127.7 117.1
Access and capacity fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 45.8 40.3 36.3
Access and capacity fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 22.6 22.4 22.0
Access and capacity fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 11.1 11.0 10.7
Access and capacity fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.4
Market data fees      
Segment Reporting Information      
Revenues 326.6 294.8 293.7
Market data fees | Options | Operating Segments      
Segment Reporting Information      
Revenues 142.2 123.8 118.8
Market data fees | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 129.7 120.8 128.3
Market data fees | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 43.0 39.4 36.7
Market data fees | Futures | Operating Segments      
Segment Reporting Information      
Revenues 10.0 9.3 8.5
Market data fees | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 1.7 1.5 1.4
Market data fees | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees cost of revenues      
Segment Reporting Information      
Revenues 285.4 426.3 223.7
Regulatory fees cost of revenues | Options | Operating Segments      
Segment Reporting Information      
Revenues 89.3 105.9 69.6
Regulatory fees cost of revenues | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 196.0 320.2 153.8
Regulatory fees cost of revenues | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees cost of revenues | Futures | Operating Segments      
Segment Reporting Information      
Revenues 0.1 0.2 0.3
Regulatory fees cost of revenues | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Regulatory fees cost of revenues | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Other revenue      
Segment Reporting Information      
Revenues 95.9 99.0 77.3
Other revenue | Options | Operating Segments      
Segment Reporting Information      
Revenues 5.8 5.5 6.4
Other revenue | North American Equities | Operating Segments      
Segment Reporting Information      
Revenues 8.9 7.6 7.5
Other revenue | Europe and Asia Pacific | Operating Segments      
Segment Reporting Information      
Revenues 79.9 84.9 62.6
Other revenue | Futures | Operating Segments      
Segment Reporting Information      
Revenues 0.2 0.0 0.2
Other revenue | Global FX | Operating Segments      
Segment Reporting Information      
Revenues 1.1 0.8 0.6
Other revenue | Digital | Operating Segments      
Segment Reporting Information      
Revenues 0.0 0.2 0.0
Cash and spot markets      
Segment Reporting Information      
Revenues 1,834.8 1,670.0 1,445.1
Cash and spot markets | Transaction and clearing fees      
Segment Reporting Information      
Revenues 1,483.1 1,196.3 1,149.7
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 66.2 60.4 71.3
Cash and spot markets | Regulatory fees cost of revenues      
Segment Reporting Information      
Revenues 196.0 320.2 153.8
Cash and spot markets | Other revenue      
Segment Reporting Information      
Revenues 89.5 93.1 70.3
Data Vantage      
Segment Reporting Information      
Revenues 635.5 576.6 539.2
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 408.7 369.8 347.5
Data Vantage | Market data fees      
Segment Reporting Information      
Revenues 223.9 203.9 188.7
Data Vantage | Regulatory fees cost of revenues      
Segment Reporting Information      
Revenues 0.0 0.0 0.0
Data Vantage | Other revenue      
Segment Reporting Information      
Revenues 2.9 2.9 3.0
Derivatives markets      
Segment Reporting Information      
Revenues 2,243.9 1,847.9 1,789.2
Derivatives markets | Transaction and clearing fees      
Segment Reporting Information      
Revenues 2,114.5 1,708.3 1,681.6
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 36.5 30.5 33.7
Derivatives markets | Regulatory fees cost of revenues      
Segment Reporting Information      
Revenues 89.4 106.1 69.9
Derivatives markets | Other revenue      
Segment Reporting Information      
Revenues $ 3.5 $ 3.0 $ 4.0