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Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 02, 2020	Jan. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unamortized discount and issuance costs	$ (31.0)			$ (117.9)
Long-term debt, gross	2,152.5			3,467.3
Less: Current Portion	(22.0)			0.0
Total long-term debt, net of current portion	2,130.5			3,467.3
Term Loan Due 2027 \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	2,183.5			0.0
Stated interest rate		1.00%
ABL Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0.0			145.2
Term Loan Due 2023 \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0.0			2,070.0
9.250% Notes due 2024 \| Notes Payable to Banks
Debt Instrument [Line Items]
Long-term debt, gross	$ 0.0			750.0
Stated interest rate	9.25%		9.25%
12.00%/13.00% Senior PIK Toggle Notes due 2022 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 0.0			$ 500.0
Cash interest rate, stated percentage	12.00%			12.00%
PIK interest rate, stated percentage	13.00%			13.00%
10.00% Notes due 2024 \| Notes Payable to Banks
Debt Instrument [Line Items]
Long-term debt, gross	$ 0.0			$ 120.0
Stated interest rate				10.00%