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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 76.0 $ 186.1
Additions   14.0
Changes in fair value (23.8) (107.1)
Ending balance 52.2 93.0
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 62.0 186.1
Additions   0.0
Changes in fair value (23.8) (107.1)
Ending balance 38.2 79.0
Other liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 14.0 0.0
Additions   14.0
Changes in fair value 0.0 0.0
Ending balance $ 14.0 $ 14.0