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LONG-TERM DEBT AND CREDIT FACILITIES (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long-term debt    
Notional amount $ 1,947.7  
Deferred Financing Costs (23.8)  
Carrying Amount 1,923.9 $ 1,837.4
Fair Value 2,199.5 1,981.9
Senior notes    
Long-term debt    
Notional amount 1,747.7  
Deferred Financing Costs (7.9)  
Carrying Amount 1,739.8 1,737.4
Fair Value $ 1,999.5 $ 1,881.9
Senior notes | Minimum    
Long-term debt    
Interest rate (as a percent) 4.50% 4.50%
Senior notes | Maximum    
Long-term debt    
Interest rate (as a percent) 6.875% 6.875%
Revolving credit facility    
Long-term debt    
Carrying Amount   $ 100.0
Fair Value   $ 100.0
Interest rate (as a percent) 1.625% 1.625%
Long-term debt and credit facility    
Long-term debt    
Notional amount $ 1,447.7  
Deferred Financing Costs (23.5)  
Carrying Amount 1,424.2 $ 1,837.4
Fair Value 1,690.2 $ 1,981.9
Less: current portion    
Long-term debt    
Notional amount (500.0)  
Deferred Financing Costs 0.3  
Carrying Amount (499.7)  
Fair Value (509.3)  
Tasiat Mauritamie Ltd. S.A    
Long-term debt    
Notional amount 200.0  
Deferred Financing Costs (15.9)  
Carrying Amount 184.1  
Fair Value $ 200.0  
Interest rate (as a percent) 4.38%