Debt And Financing - Total Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Par value	$ 926.1	$ 1,010.3
Premium/(Discount), Debt	(10.4)	(2.7)
Debt Issuance Costs, Noncurrent, Net	(9.6)	(10.5)
Long-term debt	906.1	997.1
Long-term Debt, Current Maturities	(30.6)	(16.8)
Par value, excluding current maturities	895.5	993.5
Premium/(Discount), Noncurrent Maturities	(10.4)	(2.7)
Long-term debt, less current portion	875.5	980.3
Term Loan
Debt Instrument [Line Items]
Par value	595.5	638.5
Premium/(Discount), Debt	(10.4)	(2.7)
Debt Issuance Costs, Noncurrent, Net	(8.3)	(8.6)
Long-term debt	$ 576.8	$ 627.2
Interest rate	10.10%	8.00%
Effective interest rate	10.45%	8.20%
Par Value, Current Maturities	$ (18.0)	$ (6.7)
Premium/(Discount), Current Maturities	0.0	0.0
Debt Issuance Costs, Current, Net	0.0	0.0
Long-term Debt, Current Maturities	(18.0)	(6.7)
Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Par value	0.0	0.0
Premium/(Discount), Debt	0.0	0.0
Debt Issuance Costs, Noncurrent, Net	0.0	0.0
Long-term debt	0.0	0.0
Secured Second A&R CDA
Debt Instrument [Line Items]
Par value	26.9	28.7
Premium/(Discount), Debt	0.0	0.0
Debt Issuance Costs, Noncurrent, Net	(0.1)	(0.6)
Long-term debt	$ 26.8	$ 28.1
Effective interest rate	7.80%	7.50%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par value	$ 48.2	$ 73.2
Premium/(Discount), Debt	0.0	0.0
Debt Issuance Costs, Noncurrent, Net	(0.3)	0.0
Long-term debt	$ 47.9	$ 73.2
Effective interest rate	7.80%	7.50%
Par Value, Current Maturities	$ (1.5)
Premium/(Discount), Current Maturities	0.0
Debt Issuance Costs, Current, Net	0.0
Long-term Debt, Current Maturities	(1.5)
Lease financing obligations
Debt Instrument [Line Items]
Par value	255.5	$ 269.9
Premium/(Discount), Debt	0.0	0.0
Debt Issuance Costs, Noncurrent, Net	(0.9)	(1.3)
Long-term debt	$ 254.6	$ 268.6
Effective interest rate	12.10%	12.00%
Par Value, Current Maturities	$ (11.1)	$ (10.1)
Premium/(Discount), Current Maturities	0.0	0.0
Debt Issuance Costs, Current, Net	0.0	0.0
Long-term Debt, Current Maturities	$ (11.1)	$ (10.1)
Minimum \| Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Interest rate	1.75%	2.00%
Minimum \| Secured Second A&R CDA
Debt Instrument [Line Items]
Interest rate	6.30%	3.30%
Minimum \| Unsecured Second A&R CDA
Debt Instrument [Line Items]
Interest rate	6.30%	3.30%
Minimum \| Lease financing obligations
Debt Instrument [Line Items]
Interest rate	9.00%	9.00%
Maximum \| Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Interest rate		2.50%
Maximum \| Secured Second A&R CDA
Debt Instrument [Line Items]
Interest rate	18.30%	18.30%
Maximum \| Unsecured Second A&R CDA
Debt Instrument [Line Items]
Interest rate	18.30%	18.30%
Maximum \| Lease financing obligations
Debt Instrument [Line Items]
Interest rate	18.20%	18.20%
LIBOR \| Term Loan
Debt Instrument [Line Items]
Floor Interest Rate	1.00%	1.00%
Basis spread on variable rate	8.50%	7.00%

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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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 accumulated amortization, of debt issuance costs classified as noncurrent. 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. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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, Face Amount, Excluding Current Maturities

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

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