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ACCRUED EXPENSES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued health insurance $ 14.7 $ 9.0
Accrual loss for workers' compensation, comprehensive general liability and vehicle liability self-insurance programs 53.9 47.9
Accrued compensation and benefits increase 22.0  
Accrued legal matters 7.5 1.4
Accrued severance charges 2.7 $ 3.5
Derivative liability $ 8.8