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

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Debt And Financing - Additional Details (Details)		12 Months Ended
Debt And Financing - Additional Details (Details)	Jan. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($)	Jul. 26, 2017 USD ($)	Feb. 13, 2014 USD ($)
Debt Instrument [Line Items]
Contribution rate of subsidiaries to funds		25.00%
Unamortized discount (premium), net, noncurrent maturities		$ 7,800,000	$ 10,400,000
Book Value
Debt Instrument [Line Items]
Fair value of long term debt		874,900,000	906,100,000
Fair Value
Debt Instrument [Line Items]
Fair value of long term debt		850,700,000	929,900,000
First Amendment To CDA
Debt Instrument [Line Items]
Annual amortization of amount outstanding, percent	2.00%
Payments to fund CDA	$ 25,000,000
ABL Facility
Debt Instrument [Line Items]
Managed Accessibility		1,200,000	26,700,000
Restricted cash		25,000,000	0
Cash, cash equivalents and managed accessibility		$ 203,800,000	$ 118,300,000
2014 Financing
Debt Instrument [Line Items]
Number of credit facilities \| facility		2
Term Loan
Debt Instrument [Line Items]
Effective interest rate		11.40%	10.50%
Term Loan \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt		$ 559,400,000	$ 576,800,000
Term Loan \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt		546,000,000	596,900,000
Term Loan \| Amendment No. 4
Debt Instrument [Line Items]
Principal amount issued		600,000,000
Additional payment required				$ 35,200,000
Right to increase New Term Loan		250,000,000
Annual principal payment				35,200,000
Unamortized discount				9,700,000
Deferred finance costs				$ 9,700,000
Term Loan \| 2014 Financing
Debt Instrument [Line Items]
Principal amount issued		600,000,000
ABL Facility \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt		0	0
ABL Facility \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt		0	0
ABL Facility \| ABL Facility
Debt Instrument [Line Items]
Total cash and availability		$ 39,200,000	68,900,000
ABL Facility \| ABL Facility \| Minimum
Debt Instrument [Line Items]
Interest rate		1.75%
ABL Facility
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
ABL Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage		0.375%
ABL Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage		0.25%
ABL Facility \| 2014 Financing
Debt Instrument [Line Items]
Principal amount issued					$ 450,000,000
Letter of Credit \| ABL Facility
Debt Instrument [Line Items]
Maximum borrowing capacity, uncommitted accordion					$ 100,000,000
Letters of credit outstanding, amount		$ 341,300,000	$ 352,600,000
Collateral line cap, percent		10.00%
Restricted cash		$ (25,000,000)
Lease financing obligations
Debt Instrument [Line Items]
Effective interest rate		14.90%	12.10%
Lease financing obligations \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt		$ 242,200,000	$ 254,600,000
Lease financing obligations \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt		234,700,000	257,700,000
Other Debt Obligations \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt		73,300,000	74,700,000
Other Debt Obligations \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt		$ 70,000,000	$ 75,300,000
LIBOR \| Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		8.50%	8.50%
LIBOR \| 2014 Term Loan \| Amendment No. 4
Debt Instrument [Line Items]
Variable rate basis, option two, minimum variable rate basis		1.00%
Basis spread on variable rate		6.50%
Alternate Base Rate \| 2014 Term Loan \| Amendment No. 4
Debt Instrument [Line Items]
Basis spread on variable rate		8.50%
ABL Base Rate \| ABL Facility
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%