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LONG-TERM OBLIGATIONS - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal amount $ 191.8 $ 217.7
Deferred debt issuance costs (2.2) (2.7)
Long-term obligations, including current portion 189.6 215.0
Current portion of long-term obligations (10.2) (10.5)
Long-term obligations, less current portion 179.4 204.5
Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Principal amount 159.7 164.1
Revolving Credit Facility [Member] | Five Hundred Fifty Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal amount 30.0 51.0
Finance leases [Member]    
Debt Instrument [Line Items]    
Principal amount $ 2.1 $ 2.6