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LONG-TERM DEBT AND CREDIT FACILITIES - Senior notes (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Long-term debt    
Principal amount $ 1,947.7  
Senior notes    
Long-term debt    
Principal amount $ 1,747.7  
Redemption price (as a percent) 100.00%  
Redeem of the principal amount (as a percent) 100.00%  
Prior to maturity upon certain fundamental changes 101.00%  
Senior notes | Minimum    
Long-term debt    
Interest rate (as a percent) 4.50% 4.50%
Premium add to the redemption price (as a percent) 45  
Senior notes | Maximum    
Long-term debt    
Interest rate (as a percent) 6.875% 6.875%
Premium add to the redemption price (as a percent) 50  
5.125% senior notes    
Long-term debt    
Interest rate (as a percent) 5.125%  
Principal amount $ 500.0  
Redeemable period, before maturity date 3 months  
5.950% senior notes    
Long-term debt    
Interest rate (as a percent) 5.95%  
Principal amount $ 500.0  
Redeemable period, before maturity date 3 months  
4.50% senior notes    
Long-term debt    
Interest rate (as a percent) 4.50%  
Principal amount $ 500.0  
Redeemable period, before maturity date 3 months  
6.875% senior notes    
Long-term debt    
Interest rate (as a percent) 6.875%  
Principal amount $ 250.0  
Redeemable period, before maturity date 6 months