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

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

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Amount, after accumulated amortization, of debt discount.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Contribution Rate Of Subsidiaries To Funds

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Debt Instrument, Amendment, Additional Payment Required

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Line Of Credit Facility, Total Cash and Availability

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Right to increase New Term Loan

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Debt And Financing - Additional Details (Details)			12 Months Ended
Debt And Financing - Additional Details (Details)	Jan. 30, 2018 USD ($)	Jul. 26, 2017 USD ($)	Dec. 31, 2017 USD ($) facility	Dec. 31, 2016 USD ($)	Feb. 13, 2014 USD ($)
Debt Instrument [Line Items]
Unamortized discount (premium), net, noncurrent maturities			$ 10,400,000	$ 2,700,000
Book Value
Debt Instrument [Line Items]
Fair value of long term debt			906,100,000	997,100,000
Fair Value
Debt Instrument [Line Items]
Fair value of long term debt			$ 929,900,000	$ 999,000,000
Second Amended And Restated Contribution Deferral Agreement
Debt Instrument [Line Items]
Contribution rate of subsidiaries to funds			25.00%
2014 Financing
Debt Instrument [Line Items]
Number of credit facilities \| facility			2
Term Loan
Debt Instrument [Line Items]
Interest rate			10.10%	8.00%
Effective interest rate			10.45%	8.20%
Term Loan \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt			$ 576,800,000	$ 627,200,000
Term Loan \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt			596,900,000	638,100,000
Term Loan \| Amendment No. 4
Debt Instrument [Line Items]
Principal amount issued			600,000,000
Additional payment required		$ 35,200,000
Premium prepayment within twelve month of amendment, percent		1.00%
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
Line of Credit \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt			0	0
Line of Credit \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt			0	0
Line of Credit \| ABL Facility
Debt Instrument [Line Items]
Total cash and availability			68,900,000	89,000,000
Total able to be drawn			$ 26,700,000	$ 44,400,000
Collateral line cap, percent			10.00%
Fixed charge coverage ratio			1.10
Line of Credit \| ABL Facility \| Maximum
Debt Instrument [Line Items]
Interest rate				2.50%
Line of Credit \| ABL Facility \| Minimum
Debt Instrument [Line Items]
Interest rate			1.75%	2.00%
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			$ 352,600,000	$ 357,200,000
Lease financing obligations
Debt Instrument [Line Items]
Effective interest rate			12.10%	12.00%
Lease financing obligations \| Maximum
Debt Instrument [Line Items]
Interest rate			18.20%	18.20%
Lease financing obligations \| Minimum
Debt Instrument [Line Items]
Interest rate			9.00%	9.00%
Lease financing obligations \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt			$ 254,600,000	$ 268,600,000
Lease financing obligations \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt			257,700,000	259,100,000
Other Debt Obligations \| Book Value
Debt Instrument [Line Items]
Fair value of long term debt			74,700,000	101,300,000
Other Debt Obligations \| Fair Value
Debt Instrument [Line Items]
Fair value of long term debt			$ 75,300,000	$ 101,800,000
LIBOR \| Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate			8.50%	7.00%
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%
ABL Facility
Debt Instrument [Line Items]
Total cash and availability			$ 118,300,000	$ 181,100,000
Subsequent Event \| First Amendment To CDA
Debt Instrument [Line Items]
Annual amortization of amount outstanding, percent	2.00%
Payments to fund CDA	$ 25,000,000