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STOCK-BASED COMPENSATION - Narrative (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees $ 33.0 $ 67.0  
Liabilities from share-based payment transactions 57.0 67.0  
RSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees $ 31.0 $ 45.0  
Weighted average remaining contractual life 9 months 9 months 29 days  
Number of units outstanding (shares) | shares 2,518 2,623 3,110
Liabilities from share-based payment transactions $ 31.0 $ 38.6 $ 41.5
PGSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of units outstanding (shares) | shares 2,873 3,962  
Liabilities from share-based payment transactions $ 43.0 $ 52.0  
Stock options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees $ 0.0 $ 0.0  
Vesting period 4 years    
Exercise period 7 years    
Number of shares available for grant (shares) | shares 0 100  
Intrinsic value of options exercised $ 1.0 $ 2.0  
Unrecognized compensation cost $ 0.0 $ 0.0