Debt and Financing - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions		Dec. 31, 2022		Dec. 31, 2021
Debt Instrument [Line Items]
Par Value		$ 1,574.7		$ 1,614.5
Discount		(8.4)		(15.0)
Commitment Fee		(19.2)		(30.2)
Debt Issuance Costs		(9.1)		(14.8)
Book Value		1,538.0		1,554.5
Book Value, Current Maturities		(71.8)		(72.3)
Par Value, Excluding Current Maturities		1,502.9		1,542.1
Premium (Discount), Excluding Current Maturities		(8.4)		(15.0)
Commitment Fee, Excluding Current Maturities		(19.2)		(30.2)
Debt Issuance Costs, Noncurrent		(9.1)		(14.7)
Book Value, Excluding Current Maturities		1,466.2		1,482.2
Tranche A | UST Loan
Debt Instrument [Line Items]
Par Value	[1]	325.7		311.4
Discount	[1]	0.0		0.0
Commitment Fee	[1]	(8.2)		(12.9)
Debt Issuance Costs	[1]	(2.2)		(3.4)
Book Value	[1]	$ 315.3		$ 295.1
Effective Interest Rate	[1]	6.30%		6.40%
Tranche B | UST Loan
Debt Instrument [Line Items]
Par Value		$ 400.0		$ 400.0
Discount		0.0		0.0
Commitment Fee		(11.0)		(17.3)
Debt Issuance Costs		(2.9)		(4.5)
Book Value		$ 386.1		$ 378.2
Effective Interest Rate		6.50%		6.50%
Term Loan
Debt Instrument [Line Items]
Par Value		$ 569.1	[1]	$ 612.5
Discount		(8.4)	[1]	(15.0)
Commitment Fee		0.0	[1]	0.0
Debt Issuance Costs		(3.9)	[1]	(6.6)
Book Value		$ 556.8	[1]	$ 590.9
Effective Interest Rate		9.50%	[1]	9.50%
Par Value, Current Maturities		$ 0.0
Discount, Current Maturities		0.0
Commitment Fee, Current Maturities		0.0
Deferred Issuance Costs, Current		0.0
Book Value, Current Maturities		0.0
ABL Facility | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Par Value		0.0		$ 0.0
Discount		0.0		0.0
Commitment Fee		0.0		0.0
Debt Issuance Costs		0.0		0.0
Book Value		0.0		0.0
Secured Second A&R CDA
Debt Instrument [Line Items]
Par Value		23.5		24.1
Discount		0.0		0.0
Commitment Fee		0.0		0.0
Debt Issuance Costs		0.0		0.0
Book Value		$ 23.5		$ 24.1
Effective Interest Rate		7.70%		7.70%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par Value		$ 42.5		$ 42.5
Discount		0.0		0.0
Commitment Fee		0.0		0.0
Debt Issuance Costs		0.0		(0.1)
Book Value		$ 42.5		$ 42.4
Effective Interest Rate		7.70%		7.70%
Par Value, Current Maturities				$ (1.5)
Discount, Current Maturities				0.0
Commitment Fee, Current Maturities				0.0
Deferred Issuance Costs, Current				0.0
Book Value, Current Maturities				(1.5)
Secured and Unsecured Second A&R CDA [Member]
Debt Instrument [Line Items]
Par Value, Current Maturities		$ 66.0		(66.6)
Discount, Current Maturities		0.0		0.0
Commitment Fee, Current Maturities		0.0		0.0
Deferred Issuance Costs, Current		0.0		0.1
Book Value, Current Maturities		(66.0)		(66.5)
Lease financing obligations
Debt Instrument [Line Items]
Par Value		213.9		224.0
Discount		0.0		0.0
Commitment Fee		0.0		0.0
Debt Issuance Costs		(0.1)		(0.2)
Book Value		$ 213.8		$ 223.8
Effective Interest Rate		17.60%		17.40%
Par Value, Current Maturities		$ 5.8		$ (4.3)
Discount, Current Maturities		0.0		0.0
Commitment Fee, Current Maturities		0.0		0.0
Deferred Issuance Costs, Current		0.0		0.0
Book Value, Current Maturities		$ (5.8)		$ (4.3)

[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.