DEBT - Components of Long-term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 3,374.0	$ 3,322.5
Less current portion	(107.2)	(217.5)
Long-term debt	3,266.8	3,105.0
Short-term borrowings	$ 0.3	$ 2.5
Weighted-average interest rate (as a percent)	11.70%	11.70%
Amended 2016 Revolving Credit Facility (Tranche A) due 2023
Debt Instrument [Line Items]
Long-term debt	$ 74.7	$ 136.7
SISO Term Loan Facility due 2023
Debt Instrument [Line Items]
Long-term debt	95.8	0.0
2021 Foreign Asset-Based Term Facility due 2023
Debt Instrument [Line Items]
Long-term debt	71.9	0.0
2020 ABL FILO Term Loans due 2023
Debt Instrument [Line Items]
Long-term debt	50.0	50.0
2020 Troubled-debt-restructuring: future interest
Debt Instrument [Line Items]
Long-term debt	53.5	57.8
2020 BrandCo Term Loan Facility due 2025
Debt Instrument [Line Items]
Long-term debt	1,730.1	1,719.8
2016 Term Loan Facility: 2016 Term Loan due 2023 and 2025
Debt Instrument [Line Items]
Long-term debt	871.9	874.8
2018 Foreign Asset-Based Term Facility due 2021
Debt Instrument [Line Items]
Long-term debt	$ 0.0	57.7
6.25% Senior Notes due 2024
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.25%
Long-term debt	$ 425.8	425.4
Spanish Government Loan due 2025
Debt Instrument [Line Items]
Long-term debt	$ 0.3	$ 0.3

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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