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LONG-TERM OBLIGATIONS - Fair Value of Debt (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Senior Notes | 5-5/8% Notes    
Debt Instrument [Line Items]    
Book Value $ 600.0  
Quotes $ 0.99250  
Senior Notes | 5-5/8% Notes | Fair Value, Inputs, Level 1    
Debt Instrument [Line Items]    
Fair Value $ 596.0  
Line of Credit | Secured Debt | 2017 Credit Agreement Term Loan (net of discount)    
Debt Instrument [Line Items]    
Book Value $ 394.2 $ 395.1
Quotes $ 1.00594  
Line of Credit | Secured Debt | 2017 Credit Agreement Term Loan (net of discount) | Fair Value, Inputs, Level 1    
Debt Instrument [Line Items]    
Fair Value $ 397.0