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LONG-TERM DEBT AND CREDIT FACILITIES - Senior notes (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Long-term debt    
Debt repayments $ 200.0 $ 80.0
Principal amount 1,847.0  
Senior notes    
Long-term debt    
Principal amount $ 1,747.0  
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% 5.125%
Principal amount $ 500.0 $ 500.0
Redeemable period, before maturity date 3 months  
5.950% senior notes    
Long-term debt    
Interest rate (as a percent) 5.95% 5.95%
Principal amount $ 500.0 $ 500.0
Redeemable period, before maturity date 3 months  
4.50% senior notes    
Long-term debt    
Interest rate (as a percent) 4.50% 4.50%
Principal amount $ 500.0 $ 500.0
Redeemable period, before maturity date 3 months  
6.875% senior notes    
Long-term debt    
Interest rate (as a percent) 6.875% 6.875%
Principal amount $ 250.0 $ 250.0
Redeemable period, before maturity date 6 months