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FAIR VALUE MEASUREMENTS - Schedule of Change in Contingent Consideration Liability (Details) - Level 3 - Fair value, measurements, recurring - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 23.0 $ 161.2 $ 95.8 $ 306.3
Measurement period adjustment 0.0 0.0 0.0 (49.3)
Unrealized gains, included in earnings 0.0 (29.9) (72.8) (125.7)
Ending balance $ 23.0 $ 131.3 $ 23.0 $ 131.3