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SEGMENT REPORTING - Summarized financial information by reportable segment (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2022
segment
Mar. 31, 2022
segment
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information          
Number of reportable segments | segment 6 5 6    
Revenues     $ 3,958.5 $ 3,494.8 $ 3,427.1
Operating income (loss)     489.6 805.9 662.2
Operating Segments | Options          
Segment Reporting Information          
Revenues     1,823.2 1,505.0 1,330.1
Operating income (loss)     740.5 538.0 430.4
Operating Segments | North American Equities          
Segment Reporting Information          
Revenues     1,681.7 1,570.5 1,789.5
Operating income (loss)     146.6 156.1 159.5
Operating Segments | Europe and Asia Pacific          
Segment Reporting Information          
Revenues     264.6 240.3 140.5
Operating income (loss)     38.1 56.0 33.5
Operating Segments | Futures          
Segment Reporting Information          
Revenues     119.8 120.6 109.2
Operating income (loss)     55.2 66.0 53.8
Operating Segments | Global FX          
Segment Reporting Information          
Revenues     68.9 58.1 57.8
Operating income (loss)     8.8 2.7 6.0
Operating Segments | Digital          
Segment Reporting Information          
Revenues     0.3    
Operating income (loss)     (491.4)    
Corporate Items and Eliminations          
Segment Reporting Information          
Revenues       0.3  
Operating income (loss)     $ (8.2) $ (12.9) $ (21.0)