DEBT - Summary of Debt and Capital Leases (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance leases	$ 67.3
Finance leases		$ 71.2
Debt issuance costs	(7.2)	(9.0)
Total debt	687.3	714.1
Less: current maturities	(32.5)	(30.8)
Long-term debt, net of current maturities	654.8	683.3
Asset based revolving credit facility
Debt Instrument [Line Items]
Long-term debt	0.0	15.0
Promissory notes
Debt Instrument [Line Items]
Long-term debt	20.4	28.5
Senior unsecured notes due 2024 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 606.8	$ 608.4
Effective interest rate	6.56%	6.56%

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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