LONG-TERM OBLIGATIONS - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ 10.6
Finance lease obligations	4.4	$ 3.7
Net debt	1,169.4
Total debt	1,173.8	1,175.7
Notes payable and current portion of long-term debt	(7.6)	(6.9)
Long-term debt, less current portion	1,166.2	1,168.8
Revolving Credit Facility
Debt Instrument [Line Items]
Net debt	$ 0.0	$ 0.0
Senior Notes \| 5-5/8% Senior Notes due February 1, 2025
Debt Instrument [Line Items]
Interest rate of debt securities (as a percent)	5.625%	5.625%
Debt Issuance Costs, Net	$ 6.0	$ 7.5
Net debt	594.0	592.5
Senior Notes \| Original Term Loan
Debt Instrument [Line Items]
Debt Issuance Costs, Net	3.0	4.0
Net debt	381.0	383.8
Senior Notes \| 2019 Term Loan (net of discount)
Debt Instrument [Line Items]
Debt Issuance Costs, Net	1.6	2.1
Net debt	194.3	195.6
Other Debt Obligations
Debt Instrument [Line Items]
Net debt	$ 0.1	$ 0.1

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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