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LONG-TERM OBLIGATIONS - Fair Value of Debt (Details)
$ in Millions
Jun. 30, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Senior Notes | 5-5/8% Notes    
Debt Instrument [Line Items]    
Book Value $ 600.0  
Senior Notes | 5-5/8% Notes | Fair Value, Inputs, Level 1    
Debt Instrument [Line Items]    
Fair Value 593.0  
Line of Credit | Secured Debt | 2017 Credit Agreement Term Loan (net of discount)    
Debt Instrument [Line Items]    
Book Value 393.2 $ 395.1
Line of Credit | Secured Debt | 2017 Credit Agreement Term Loan (net of discount) | Fair Value, Inputs, Level 1    
Debt Instrument [Line Items]    
Fair Value $ 393.0  
Measurement Input, Quoted Price | Senior Notes | 5-5/8% Notes    
Debt Instrument [Line Items]    
Quotes | $ / shares 0.98750  
Measurement Input, Quoted Price | Line of Credit | Secured Debt | 2017 Credit Agreement Term Loan (net of discount)    
Debt Instrument [Line Items]    
Quotes | $ / shares 1.00042