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LONG-TERM OBLIGATIONS - Fair Value of Debt (Details)
$ in Millions
Mar. 31, 2021
USD ($)
$ / shares
Senior Notes | 5-5/8% Notes  
Debt Instrument [Line Items]  
Book Value $ 600.0
Senior Notes | 5-5/8% Notes | Fair Value, Inputs, Level 2  
Debt Instrument [Line Items]  
Fair Value 617.3
Line of Credit | Secured Debt | Original Term Loan  
Debt Instrument [Line Items]  
Book Value 383.1
Line of Credit | Secured Debt | Original Term Loan | Fair Value, Inputs, Level 2  
Debt Instrument [Line Items]  
Fair Value $ 382.0
Measurement Input, Quoted Price | Senior Notes | 5-5/8% Notes  
Debt Instrument [Line Items]  
Quotes | $ / shares 1.02875
Measurement Input, Quoted Price | Line of Credit | Secured Debt | Original Term Loan  
Debt Instrument [Line Items]  
Quotes | $ / shares 0.99708