v3.26.1
REVENUE RECOGNITION - Revenue by Product Line and Segment (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
fee
Jun. 30, 2025
USD ($)
Segment Reporting        
Number of reportable segments | segment     5  
Number of types of regulatory fees recognized | fee     2  
Revenues $ 1,442.8 $ 1,173.5 $ 2,715.6 $ 2,368.5
Transaction and clearing fees        
Segment Reporting        
Revenues 1,035.8 867.7 2,062.2 1,700.3
Access and capacity fees        
Segment Reporting        
Revenues 115.6 101.2 228.8 199.0
Market data fees        
Segment Reporting        
Revenues 91.8 82.4 183.6 160.2
Regulatory fees        
Segment Reporting        
Revenues 164.6 96.8 175.0 258.6
Other revenue        
Segment Reporting        
Revenues 35.0 25.4 66.0 50.4
Services transferred at a point in time        
Segment Reporting        
Revenues 1,235.4 989.9 2,303.2 2,009.3
Services transferred over time        
Segment Reporting        
Revenues 207.4 183.6 412.4 359.2
Options        
Segment Reporting        
Revenues 743.1 575.8 1,411.5 1,160.4
Options | Transaction and clearing fees        
Segment Reporting        
Revenues 601.4 468.3 1,160.6 932.8
Options | Access and capacity fees        
Segment Reporting        
Revenues 54.1 45.3 107.5 89.3
Options | Market data fees        
Segment Reporting        
Revenues 42.7 35.6 86.8 69.2
Options | Regulatory fees        
Segment Reporting        
Revenues 42.6 25.4 52.7 66.5
Options | Other revenue        
Segment Reporting        
Revenues 2.3 1.2 3.9 2.6
Options | Services transferred at a point in time        
Segment Reporting        
Revenues 646.3 494.9 1,217.2 1,001.9
Options | Services transferred over time        
Segment Reporting        
Revenues 96.8 80.9 194.3 158.5
North American Equities        
Segment Reporting        
Revenues 520.0 441.8 935.7 901.9
North American Equities | Transaction and clearing fees        
Segment Reporting        
Revenues 321.3 300.2 663.3 571.9
North American Equities | Access and capacity fees        
Segment Reporting        
Revenues 40.3 35.6 79.0 70.1
North American Equities | Market data fees        
Segment Reporting        
Revenues 33.8 32.8 66.5 63.8
North American Equities | Regulatory fees        
Segment Reporting        
Revenues 122.0 71.3 122.3 192.0
North American Equities | Other revenue        
Segment Reporting        
Revenues 2.6 1.9 4.6 4.1
North American Equities | Services transferred at a point in time        
Segment Reporting        
Revenues 445.9 373.4 790.2 768.0
North American Equities | Services transferred over time        
Segment Reporting        
Revenues 74.1 68.4 145.5 133.9
Europe and Asia Pacific        
Segment Reporting        
Revenues 117.8 99.0 237.2 192.1
Europe and Asia Pacific | Transaction and clearing fees        
Segment Reporting        
Revenues 64.1 54.0 132.7 104.8
Europe and Asia Pacific | Access and capacity fees        
Segment Reporting        
Revenues 12.2 11.9 24.3 22.8
Europe and Asia Pacific | Market data fees        
Segment Reporting        
Revenues 11.9 11.1 23.7 21.4
Europe and Asia Pacific | Regulatory fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Europe and Asia Pacific | Other revenue        
Segment Reporting        
Revenues 29.6 22.0 56.5 43.1
Europe and Asia Pacific | Services transferred at a point in time        
Segment Reporting        
Revenues 93.7 76.0 189.2 147.9
Europe and Asia Pacific | Services transferred over time        
Segment Reporting        
Revenues 24.1 23.0 48.0 44.2
Futures        
Segment Reporting        
Revenues 33.4 32.5 72.3 67.8
Futures | Transaction and clearing fees        
Segment Reporting        
Revenues 24.7 24.3 55.0 51.4
Futures | Access and capacity fees        
Segment Reporting        
Revenues 5.8 5.7 11.6 11.3
Futures | Market data fees        
Segment Reporting        
Revenues 2.9 2.4 5.7 4.9
Futures | Regulatory fees        
Segment Reporting        
Revenues 0.0 0.1 0.0 0.1
Futures | Other revenue        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.1
Futures | Services transferred at a point in time        
Segment Reporting        
Revenues 24.7 24.4 55.0 51.6
Futures | Services transferred over time        
Segment Reporting        
Revenues 8.7 8.1 17.3 16.2
Global FX        
Segment Reporting        
Revenues 28.5 24.4 58.9 46.3
Global FX | Transaction and clearing fees        
Segment Reporting        
Revenues 24.3 20.9 50.6 39.4
Global FX | Access and capacity fees        
Segment Reporting        
Revenues 3.2 2.7 6.4 5.5
Global FX | Market data fees        
Segment Reporting        
Revenues 0.5 0.5 0.9 0.9
Global FX | Regulatory fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Global FX | Other revenue        
Segment Reporting        
Revenues 0.5 0.3 1.0 0.5
Global FX | Services transferred at a point in time        
Segment Reporting        
Revenues 24.8 21.2 51.6 39.9
Global FX | Services transferred over time        
Segment Reporting        
Revenues 3.7 3.2 7.3 6.4
Cash and Spot Markets        
Segment Reporting        
Revenues 580.3 487.6 1,062.5 988.5
Cash and Spot Markets | Transaction and clearing fees        
Segment Reporting        
Revenues 409.5 375.1 846.4 716.1
Cash and Spot Markets | Access and capacity fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Cash and Spot Markets | Market data fees        
Segment Reporting        
Revenues 16.3 17.0 32.0 32.7
Cash and Spot Markets | Regulatory fees        
Segment Reporting        
Revenues 122.0 71.3 122.3 192.0
Cash and Spot Markets | Other revenue        
Segment Reporting        
Revenues 32.5 24.2 61.8 47.7
Data Vantage        
Segment Reporting        
Revenues 181.6 158.3 362.9 310.8
Data Vantage | Transaction and clearing fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Data Vantage | Access and capacity fees        
Segment Reporting        
Revenues 115.6 101.2 228.8 199.0
Data Vantage | Market data fees        
Segment Reporting        
Revenues 65.1 56.4 132.2 110.4
Data Vantage | Regulatory fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Data Vantage | Other revenue        
Segment Reporting        
Revenues 0.9 0.7 1.9 1.4
Derivatives Markets        
Segment Reporting        
Revenues 680.9 527.6 1,290.2 1,069.2
Derivatives Markets | Transaction and clearing fees        
Segment Reporting        
Revenues 626.3 492.6 1,215.8 984.2
Derivatives Markets | Access and capacity fees        
Segment Reporting        
Revenues 0.0 0.0 0.0 0.0
Derivatives Markets | Market data fees        
Segment Reporting        
Revenues 10.4 9.0 19.4 17.1
Derivatives Markets | Regulatory fees        
Segment Reporting        
Revenues 42.6 25.5 52.7 66.6
Derivatives Markets | Other revenue        
Segment Reporting        
Revenues $ 1.6 $ 0.5 $ 2.3 $ 1.3