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LONG-TERM DEBT AND CREDIT FACILITIES (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-term debt    
Notional amount $ 1,847.0  
Deferred Financing Costs (9.6)  
Carrying Amount 1,837.4 $ 1,735.0
Fair Value 1,981.9 1,668.8
Senior notes    
Long-term debt    
Notional amount 1,747.0  
Deferred Financing Costs (9.6)  
Carrying Amount 1,737.4 1,735.0
Fair Value $ 1,881.9 $ 1,668.8
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    
Notional amount $ 100.0  
Carrying Amount 100.0  
Fair Value $ 100.0  
Revolving credit facility | LIBOR    
Long-term debt    
Interest rate (as a percent) 1.625% 1.625%