Debt and Financing - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par Value		$ 1,606.9
Discount		(13.3)
Commitment Fee		(27.5)
Debt Issuance Costs		(13.3)
Book Value		1,552.8
Book Value, Current Maturities		(70.7)	$ (72.3)
Par Value, Excluding Current Maturities		1,536.2
Premium (Discount), Excluding Current Maturities		(13.3)
Commitment Fee, Excluding Current Maturities		(27.5)
Debt Issuance Costs, Noncurrent		(13.3)
Book Value, Excluding Current Maturities		1,482.1	$ 1,482.2
Term Loan
Debt Instrument [Line Items]
Par Value	[1]	605.3
Discount	[1]	(13.3)
Commitment Fee	[1]	0.0
Debt Issuance Costs	[1]	(6.0)
Book Value	[1]	$ 586.0
Effective Interest Rate	[1]	9.50%
ABL Facility | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Par Value		$ 0.0
Discount		0.0
Commitment Fee		0.0
Debt Issuance Costs		0.0
Book Value		0.0
Tranche A | UST Loan
Debt Instrument [Line Items]
Par Value	[1]	313.8
Discount	[1]	0.0
Commitment Fee	[1]	(11.8)
Debt Issuance Costs	[1]	(3.1)
Book Value	[1]	$ 298.9
Effective Interest Rate	[1]	6.40%
Tranche B | UST Loan
Debt Instrument [Line Items]
Par Value		$ 400.0
Discount		0.0
Commitment Fee		(15.7)
Debt Issuance Costs		(4.1)
Book Value		$ 380.2
Effective Interest Rate		6.50%
Secured Second A&R CDA
Debt Instrument [Line Items]
Par Value		$ 23.5
Discount		0.0
Commitment Fee		0.0
Debt Issuance Costs		0.0
Book Value		$ 23.5
Effective Interest Rate		7.70%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par Value		$ 42.5
Discount		0.0
Commitment Fee		0.0
Debt Issuance Costs		0.0
Book Value		$ 42.5
Effective Interest Rate		7.70%
Lease financing obligations
Debt Instrument [Line Items]
Par Value		$ 221.8
Discount		0.0
Commitment Fee		0.0
Debt Issuance Costs		(0.1)
Book Value		$ 221.7
Effective Interest Rate		17.40%
Par Value, Current Maturities		$ 4.7
Discount, Current Maturities		0.0
Commitment Fee, Current Maturities		0.0
Deferred Issuance Costs, Current		0.0
Book Value, Current Maturities		(4.7)
Secured and Unsecured Second A&R CDA [Member]
Debt Instrument [Line Items]
Par Value, Current Maturities		66.0
Discount, Current Maturities		0.0
Commitment Fee, Current Maturities		0.0
Deferred Issuance Costs, Current		0.0
Book Value, Current Maturities		$ (66.0)

[1] The Par Value and the Book Value both reflect the accumulated cash funds that have been drawn, plus the accumulated paid-in-kind interest.