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REVENUE RECOGNITION - Revenue by Product Line and Segment (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
fee
segment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
segment
Segment Reporting Information          
Number of reportable segments | segment     5   6
Number of types of regulatory fees recognized | fee     2    
Revenues $ 1,173.5 $ 974.0 $ 2,368.5 $ 1,931.2  
Services transferred at a point in time          
Segment Reporting Information          
Revenues 989.9 809.8 2,009.3 1,604.9  
Services transferred over time          
Segment Reporting Information          
Revenues 183.6 164.2 359.2 326.3  
Options | Operating Segments          
Segment Reporting Information          
Revenues 575.8 482.3 1,160.4 959.7  
Options | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 494.9 409.7 1,001.9 816.3  
Options | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 80.9 72.6 158.5 143.4  
North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 441.8 353.3 901.9 702.9  
North American Equities | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 373.4 292.4 768.0 581.6  
North American Equities | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 68.4 60.9 133.9 121.3  
Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 99.0 81.6 192.1 162.3  
Europe and Asia Pacific | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 76.0 61.8 147.9 122.7  
Europe and Asia Pacific | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 23.0 19.8 44.2 39.6  
Futures | Operating Segments          
Segment Reporting Information          
Revenues 32.5 35.9 67.8 67.3  
Futures | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 24.4 28.2 51.6 51.7  
Futures | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 8.1 7.7 16.2 15.6  
Global FX | Operating Segments          
Segment Reporting Information          
Revenues 24.4 20.5 46.3 39.3  
Global FX | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 21.2 17.3 39.9 33.0  
Global FX | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 3.2 3.2 6.4 6.3  
Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.4 0.0 (0.3)  
Digital | Operating Segments | Services transferred at a point in time          
Segment Reporting Information          
Revenues 0.0 0.4 0.0 (0.4)  
Digital | Operating Segments | Services transferred over time          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.1  
Transaction and clearing fees          
Segment Reporting Information          
Revenues 867.7 697.6 1,700.3 1,416.1  
Transaction and clearing fees | Options | Operating Segments          
Segment Reporting Information          
Revenues 468.3 385.9 932.8 775.7  
Transaction and clearing fees | North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 300.2 227.2 571.9 478.9  
Transaction and clearing fees | Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 54.0 38.9 104.8 77.7  
Transaction and clearing fees | Futures | Operating Segments          
Segment Reporting Information          
Revenues 24.3 28.1 51.4 51.6  
Transaction and clearing fees | Global FX | Operating Segments          
Segment Reporting Information          
Revenues 20.9 17.1 39.4 32.6  
Transaction and clearing fees | Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.4 0.0 (0.4)  
Access and capacity fees          
Segment Reporting Information          
Revenues 101.2 90.5 199.0 180.6  
Access and capacity fees | Options | Operating Segments          
Segment Reporting Information          
Revenues 45.3 41.6 89.3 83.3  
Access and capacity fees | North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 35.6 30.6 70.1 60.3  
Access and capacity fees | Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 11.9 10.0 22.8 20.1  
Access and capacity fees | Futures | Operating Segments          
Segment Reporting Information          
Revenues 5.7 5.5 11.3 11.2  
Access and capacity fees | Global FX | Operating Segments          
Segment Reporting Information          
Revenues 2.7 2.8 5.5 5.6  
Access and capacity fees | Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.1  
Market data fees          
Segment Reporting Information          
Revenues 82.4 73.7 160.2 145.7  
Market data fees | Options | Operating Segments          
Segment Reporting Information          
Revenues 35.6 31.0 69.2 60.1  
Market data fees | North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 32.8 30.3 63.8 61.0  
Market data fees | Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 11.1 9.8 21.4 19.5  
Market data fees | Futures | Operating Segments          
Segment Reporting Information          
Revenues 2.4 2.2 4.9 4.4  
Market data fees | Global FX | Operating Segments          
Segment Reporting Information          
Revenues 0.5 0.4 0.9 0.7  
Market data fees | Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Regulatory fees          
Segment Reporting Information          
Revenues 96.8 85.9 258.6 136.1  
Regulatory fees | Options | Operating Segments          
Segment Reporting Information          
Revenues 25.4 22.6 66.5 37.9  
Regulatory fees | North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 71.3 63.2 192.0 98.1  
Regulatory fees | Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Regulatory fees | Futures | Operating Segments          
Segment Reporting Information          
Revenues 0.1 0.1 0.1 0.1  
Regulatory fees | Global FX | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Regulatory fees | Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Other revenue          
Segment Reporting Information          
Revenues 25.4 26.3 50.4 52.7  
Other revenue | Options | Operating Segments          
Segment Reporting Information          
Revenues 1.2 1.2 2.6 2.7  
Other revenue | North American Equities | Operating Segments          
Segment Reporting Information          
Revenues 1.9 2.0 4.1 4.6  
Other revenue | Europe and Asia Pacific | Operating Segments          
Segment Reporting Information          
Revenues 22.0 22.9 43.1 45.0  
Other revenue | Futures | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.1 0.0  
Other revenue | Global FX | Operating Segments          
Segment Reporting Information          
Revenues 0.3 0.2 0.5 0.4  
Other revenue | Digital | Operating Segments          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Cash and spot markets          
Segment Reporting Information          
Revenues 487.6 386.4 988.5 767.3  
Cash and spot markets | Transaction and clearing fees          
Segment Reporting Information          
Revenues 375.1 283.6 716.1 588.8  
Cash and spot markets | Access and capacity fees          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Cash and spot markets | Market data fees          
Segment Reporting Information          
Revenues 17.0 14.6 32.7 30.6  
Cash and spot markets | Regulatory fees          
Segment Reporting Information          
Revenues 71.3 63.2 192.0 98.1  
Cash and spot markets | Other revenue          
Segment Reporting Information          
Revenues 24.2 25.0 47.7 49.8  
Data Vantage          
Segment Reporting Information          
Revenues 158.3 142.1 310.8 282.3  
Data Vantage | Transaction and clearing fees          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Data Vantage | Access and capacity fees          
Segment Reporting Information          
Revenues 101.2 90.5 199.0 180.6  
Data Vantage | Market data fees          
Segment Reporting Information          
Revenues 56.4 50.9 110.4 100.2  
Data Vantage | Regulatory fees          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Data Vantage | Other revenue          
Segment Reporting Information          
Revenues 0.7 0.7 1.4 1.5  
Derivatives markets          
Segment Reporting Information          
Revenues 527.6 445.5 1,069.2 881.6  
Derivatives markets | Transaction and clearing fees          
Segment Reporting Information          
Revenues 492.6 414.0 984.2 827.3  
Derivatives markets | Access and capacity fees          
Segment Reporting Information          
Revenues 0.0 0.0 0.0 0.0  
Derivatives markets | Market data fees          
Segment Reporting Information          
Revenues 9.0 8.2 17.1 14.9  
Derivatives markets | Regulatory fees          
Segment Reporting Information          
Revenues 25.5 22.7 66.6 38.0  
Derivatives markets | Other revenue          
Segment Reporting Information          
Revenues $ 0.5 $ 0.6 $ 1.3 $ 1.4