Debt and Financing - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par Value	$ 1,614.5	$ 1,284.0
Discount	(15.0)	(21.0)
Commitment Fee	(30.2)	(22.1)
Debt Issuance Costs	(14.8)	(15.5)
Book Value	1,554.5	1,225.4
Book Value, Current Maturities	(72.3)	(4.0)
Par Value, Excluding Current Maturities	1,542.1	1,280.0
Premium (Discount), Excluding Current Maturities	(15.0)	(21.0)
Commitment Fee, Excluding Current Maturities	(30.2)	(22.1)
Debt Issuance Costs, Noncurrent	(14.7)	(15.5)
Book Value, Excluding Current Maturities	1,482.2	1,221.4
Tranche A \| UST Loan
Debt Instrument [Line Items]
Par Value	311.4	302.3
Discount	0.0	0.0
Commitment Fee	(12.9)	(17.7)
Debt Issuance Costs	(3.4)	(4.6)
Book Value	$ 295.1	$ 280.0
Effective Interest Rate	6.40%	6.50%
Tranche B \| UST Loan
Debt Instrument [Line Items]
Par Value	$ 400.0	$ 74.8
Discount	0.0	0.0
Commitment Fee	(17.3)	(4.4)
Debt Issuance Costs	(4.5)	(1.2)
Book Value	$ 378.2	$ 69.2
Effective Interest Rate	6.50%	6.50%
Term Loan
Debt Instrument [Line Items]
Par Value	$ 612.5	$ 613.0
Discount	(15.0)	(21.0)
Commitment Fee	0.0	0.0
Debt Issuance Costs	(6.6)	(9.3)
Book Value	$ 590.9	$ 582.7
Effective Interest Rate	9.50%	9.50%
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)
ABL Facility
Debt Instrument [Line Items]
Par Value		$ 0.0
Discount		0.0
Commitment Fee		0.0
Debt Issuance Costs		0.0
Book Value		0.0
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
Secured Second A&R CDA
Debt Instrument [Line Items]
Par Value	24.1	24.1
Discount	0.0	0.0
Commitment Fee	0.0	0.0
Debt Issuance Costs	0.0	(0.1)
Book Value	$ 24.1	$ 24.0
Effective Interest Rate	7.70%	7.70%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par Value	$ 42.5	$ 43.9
Discount	0.0	0.0
Commitment Fee	0.0	0.0
Debt Issuance Costs	(0.1)	(0.1)
Book Value	$ 42.4	$ 43.8
Effective Interest Rate	7.70%	7.70%
Par Value, Current Maturities		$ (1.4)
Discount, Current Maturities		0.0
Commitment Fee, Current Maturities		0.0
Deferred Issuance Costs, Current		0.0
Book Value, Current Maturities		(1.4)
Secured and Unsecured Second A&R CDA [Member]
Debt Instrument [Line Items]
Par Value, Current Maturities	$ (66.6)
Discount, Current Maturities	0.0
Commitment Fee, Current Maturities	0.0
Deferred Issuance Costs, Current	0.1
Book Value, Current Maturities	(66.5)
Lease financing obligations
Debt Instrument [Line Items]
Par Value	224.0	225.9
Discount	0.0	0.0
Commitment Fee	0.0	0.0
Debt Issuance Costs	(0.2)	(0.2)
Book Value	$ 223.8	$ 225.7
Effective Interest Rate	17.40%	17.20%
Par Value, Current Maturities	$ (4.3)	$ (2.6)
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	$ (4.3)	$ (2.6)

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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