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LONG-TERM OBLIGATIONS - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Principal amount $ 314.2 $ 245.7
Deferred debt issuance costs (2.9) (3.5)
Long-term obligations, including current portion 311.3 242.2
Current portion of long-term obligations (10.7) (9.9)
Long-term obligations, less current portion 300.6 232.3
Term Loan [Member] | One Hundred Seventy Five Million Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Principal amount 166.3 171.7
Revolving Credit Facility [Member] | 550 Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal amount 145.0 70.0
Promissory Notes [Member]    
Debt Instrument [Line Items]    
Principal amount 0.2 0.6
Finance leases [Member]    
Debt Instrument [Line Items]    
Principal amount $ 2.7 $ 3.4