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SEGMENT REPORTING - Summarized Financial Information by Reportable Segment (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
segment
Mar. 31, 2024
USD ($)
Dec. 31, 2024
segment
Segment Reporting Information      
Number of reportable segments | segment 5   6
Revenues $ 1,195.0 $ 957.2  
Operating income (loss) 353.9 282.4  
Total cost of revenues 629.8 455.1  
Revenues less cost of revenues: 565.2 502.1  
Depreciation and amortization 30.3 37.3  
Other segment operating expenses 181.0 182.4  
Non-operating (expenses) income:      
Interest expense (12.8) (13.0)  
Interest income 8.4 4.1  
(Loss) earnings on investments, net (3.3) 14.0  
Other income (expense), net 4.0 4.6  
Income (loss) before income tax provision (benefit) 350.2 292.1  
Income tax provision (benefit) 99.6 82.6  
Net income 250.6 209.5  
Operating Segments | Options      
Segment Reporting Information      
Revenues 584.6 477.4  
Operating income (loss) 257.9 216.8  
Total cost of revenues 232.2 170.0  
Revenues less cost of revenues: 352.4 307.4  
Depreciation and amortization 6.9 7.1  
Other segment operating expenses 87.6 83.5  
Non-operating (expenses) income:      
Interest expense 0.0 0.1  
Interest income 0.2 0.0  
(Loss) earnings on investments, net 0.0 0.0  
Other income (expense), net 0.0 (0.2)  
Income (loss) before income tax provision (benefit) 258.1 216.7  
Income tax provision (benefit) 0.1 0.0  
Net income 258.0 216.7  
Operating Segments | North American Equities      
Segment Reporting Information      
Revenues 460.1 349.6  
Operating income (loss) 44.4 38.0  
Total cost of revenues 365.5 257.0  
Revenues less cost of revenues: 94.6 92.6  
Depreciation and amortization 12.0 15.8  
Other segment operating expenses 38.2 38.8  
Non-operating (expenses) income:      
Interest expense 0.0 0.0  
Interest income 0.7 0.3  
(Loss) earnings on investments, net 0.3 0.0  
Other income (expense), net (0.6) 0.0  
Income (loss) before income tax provision (benefit) 44.8 38.3  
Income tax provision (benefit) 0.9 0.8  
Net income 43.9 37.5  
Operating Segments | Europe and Asia Pacific      
Segment Reporting Information      
Revenues 93.1 80.7  
Operating income (loss) 22.0 10.2  
Total cost of revenues 29.0 26.6  
Revenues less cost of revenues: 64.1 54.1  
Depreciation and amortization 7.9 7.9  
Other segment operating expenses 34.2 36.0  
Non-operating (expenses) income:      
Interest expense (1.8) (2.1)  
Interest income 1.1 0.9  
(Loss) earnings on investments, net 0.0 0.0  
Other income (expense), net (0.2) (0.2)  
Income (loss) before income tax provision (benefit) 21.1 8.8  
Income tax provision (benefit) 0.0 0.3  
Net income 21.1 8.5  
Operating Segments | Futures      
Segment Reporting Information      
Revenues 35.3 31.4  
Operating income (loss) 20.6 22.1  
Total cost of revenues 2.5 0.9  
Revenues less cost of revenues: 32.8 30.5  
Depreciation and amortization 0.6 0.6  
Other segment operating expenses 11.6 7.8  
Non-operating (expenses) income:      
Interest expense 0.0 0.0  
Interest income 0.6 0.0  
(Loss) earnings on investments, net 0.0 0.0  
Other income (expense), net 0.0 0.0  
Income (loss) before income tax provision (benefit) 21.2 22.1  
Income tax provision (benefit) 0.0 0.0  
Net income 21.2 22.1  
Operating Segments | Global FX      
Segment Reporting Information      
Revenues 21.9 18.8  
Operating income (loss) 10.3 6.6  
Total cost of revenues 0.6 0.4  
Revenues less cost of revenues: 21.3 18.4  
Depreciation and amortization 2.9 4.1  
Other segment operating expenses 8.1 7.7  
Non-operating (expenses) income:      
Interest expense 0.0 0.0  
Interest income 0.0 0.0  
(Loss) earnings on investments, net 0.0 0.0  
Other income (expense), net 0.2 (0.1)  
Income (loss) before income tax provision (benefit) 10.5 6.5  
Income tax provision (benefit) (0.1) 0.0  
Net income 10.6 6.5  
Operating Segments | Digital      
Segment Reporting Information      
Revenues 0.0 (0.7)  
Operating income (loss) 0.0 (10.2)  
Total cost of revenues 0.0 0.2  
Revenues less cost of revenues: 0.0 (0.9)  
Depreciation and amortization 0.0 1.8  
Other segment operating expenses 0.0 7.5  
Non-operating (expenses) income:      
Interest expense 0.0 0.0  
Interest income 0.0 1.1  
(Loss) earnings on investments, net 0.0 0.0  
Other income (expense), net 0.0 0.5  
Income (loss) before income tax provision (benefit) 0.0 (8.6)  
Income tax provision (benefit) 0.0 0.0  
Net income 0.0 (8.6)  
Corporate Items and Eliminations      
Segment Reporting Information      
Revenues 0.0 0.0  
Operating income (loss) (1.3) (1.1)  
Total cost of revenues 0.0 0.0  
Revenues less cost of revenues: 0.0 0.0  
Depreciation and amortization 0.0 0.0  
Other segment operating expenses 1.3 1.1  
Non-operating (expenses) income:      
Interest expense (11.0) (11.0)  
Interest income 5.8 1.8  
(Loss) earnings on investments, net (3.6) 14.0  
Other income (expense), net 4.6 4.6  
Income (loss) before income tax provision (benefit) (5.5) 8.3  
Income tax provision (benefit) 98.7 81.5  
Net income $ (104.2) $ (73.2)