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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 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 (107.1) 17.4
Ending balance 93.0 189.9
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 (107.1) 17.4
Ending balance 79.0 189.9
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