LONG-TERM OBLIGATIONS - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net debt	$ 670.6
Finance lease obligations	3.5	$ 4.4
Total debt	674.1	1,173.8
Less: Current portion of long-term debt	(5.6)	(7.6)
Long-term debt, less current portion	668.5	$ 1,166.2
Unamortized debt issuance costs	$ 7.3
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt, less current portion	Long-term debt, less current portion
Senior Notes \| 5% Notes
Debt Instrument [Line Items]
Net debt	$ 593.1	$ 0.0
Unamortized debt issuance costs	6.9
Senior Notes \| 5-5/8% Senior Notes due February 1, 2025
Debt Instrument [Line Items]
Net debt	0.0	594.0
Unamortized debt issuance costs		6.0
Senior Notes \| Original Term Loan
Debt Instrument [Line Items]
Net debt	77.4	381.0
Unamortized debt issuance costs	0.4	3.0
Senior Notes \| 2019 Term Loan (net of discount)
Debt Instrument [Line Items]
Net debt	0.0	194.3
Unamortized debt issuance costs		1.6
Other Debt Obligations
Debt Instrument [Line Items]
Net debt	$ 0.1	$ 0.1

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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