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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 40.2 $ 76.0
Changes in fair value (26.2) (23.8)
Ending balance 14.0 52.2
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 26.2 62.0
Changes in fair value (26.2) (23.8)
Ending balance 0.0 38.2
Other liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 14.0 14.0
Changes in fair value 0.0 0.0
Ending balance $ 14.0 $ 14.0