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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 186.1 $ 172.5
Additions 14.0  
Changes in fair value (106.0) 8.4
Ending balance 94.1 180.9
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 186.1 172.5
Additions 0.0  
Changes in fair value (106.0) 8.4
Ending balance 80.1 180.9
Other liability    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0.0 0.0
Additions 14.0  
Changes in fair value 0.0 0.0
Ending balance $ 14.0 $ 0.0