Debt And Financing - Total Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par Value	$ 890.0	$ 926.1
Discount	(7.8)	(10.4)
Debt Issuance Costs	(7.3)	(9.6)
Book Value	874.9	906.1
Book Value, Current Maturities	(20.7)	(30.6)
Par value, excluding current maturities	869.3	895.5
Premium/(Discount), Noncurrent Maturities	(7.8)	(10.4)
Book Value, Excluding Current Maturities	854.2	875.5
Term Loan
Debt Instrument [Line Items]
Par Value	573.7	595.5
Discount	(7.8)	(10.4)
Debt Issuance Costs	(6.5)	(8.3)
Book Value	$ 559.4	$ 576.8
Effective interest rate	11.40%	10.50%
Par Value, Current Maturities	$ (14.2)	$ (18.0)
Discount, Current Maturities	0.0	0.0
Debt Issuance Costs, Current	0.0	0.0
Book Value, Current Maturities	(14.2)	(18.0)
ABL Facility \| ABL Facility
Debt Instrument [Line Items]
Par Value	0.0	0.0
Discount	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	26.9	26.9
Discount	0.0	0.0
Debt Issuance Costs	(0.1)	(0.1)
Book Value	$ 26.8	$ 26.8
Effective interest rate	7.90%	7.80%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par Value	$ 46.7	$ 48.2
Discount	0.0	0.0
Debt Issuance Costs	(0.2)	(0.3)
Book Value	$ 46.5	$ 47.9
Effective interest rate	7.90%	7.80%
Par Value, Current Maturities	$ (1.5)	$ (1.5)
Discount, Current Maturities	0.0	0.0
Debt Issuance Costs, Current	0.0	0.0
Book Value, Current Maturities	(1.5)	(1.5)
Lease financing obligations
Debt Instrument [Line Items]
Par Value	242.7	255.5
Discount	0.0	0.0
Debt Issuance Costs	(0.5)	(0.9)
Book Value	$ 242.2	$ 254.6
Effective interest rate	14.90%	12.10%
Par Value, Current Maturities	$ (5.0)	$ (11.1)
Discount, Current Maturities	0.0	0.0
Debt Issuance Costs, Current	0.0	0.0
Book Value, Current Maturities	$ (5.0)	$ (11.1)
LIBOR \| Term Loan
Debt Instrument [Line Items]
Floor Interest Rate	1.00%	1.00%
Basis spread on variable rate	8.50%	8.50%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Debt Instrument, Floor Interest Rate

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Debt Instrument, Gross, Current Maturities

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Debt Instrument, Unamortized Discount (Premium), Net, Current Maturities

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