Debt And Financing - Additional Details (Details)				12 Months Ended
	Aug. 05, 2014 USD ($)	Feb. 13, 2014 USD ($)	Jan. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Mar. 31, 2015	Mar. 25, 2015 $ / shares	Mar. 14, 2014 shares	Jul. 22, 2011 USD ($)
Debt Instrument [Line Items]
Contribution rate of subsidiaries to funds				25.00%
Stock Issued During Period, Shares, New Issues | shares				0	0	0
Proceeds from Issuance or Sale of Equity			$ 250,000,000	$ 0	$ 0	$ 250,000,000
Repayment of long-term debt				70,700,000	16,700,000	892,700,000
Proceeds from Issuance of Long-term Debt				0	0	696,800,000
Long-term Debt, Maturities, Repayments of Principal after Year Five				234,000,000
Premium/(Discount), Debt				(2,700,000)	(4,300,000)
Long-term debt				997,100,000	1,062,400,000
Current maturities				(16,800,000)	(15,900,000)
Debt Instrument, Face Amount, Excluding Current Maturities				993,500,000	1,066,000,000
Debt Instrument, Unamortized Discount (Premium), Net, Noncurrent Maturities				2,700,000	4,300,000
Accelerated amortization of the discount				1,600,000	2,100,000	27,500,000
Long-term debt, less current portion				(980,300,000)	(1,046,500,000)
Gains (Losses) on Extinguishment of Debt				0	(600,000)	11,200,000
Extinguishment of Debt, Acceleration of Net Premiums on Old Debt					16,300,000
Expense Related to Fair Value of Incremental Shares Converted					5,100,000
Aggregate principal amount				1,010,300,000	1,081,900,000
Payments of Financing Costs					43,800,000
Capitalized Financing Costs					26,700,000
Payments of Stock Issuance Costs				$ 0	$ 0	17,100,000
Common stock, shares authorized | shares				95,000,000	95,000,000				95,000,000
Previous maximum ownership percentage					19.99%				19.99%
Amortization of Beneficial Conversion Feature on Preferred Stock				$ 0	$ 0	18,100,000
Maximum
Debt Instrument [Line Items]
Right to increase New Term Loan				250,000,000
Book Value
Debt Instrument [Line Items]
Fair value of long term debt				997,100,000	1,062,400,000
Fair Value
Debt Instrument [Line Items]
Fair value of long term debt				999,000,000	$ 979,600,000
Secured CDA [Domain]
Debt Instrument [Line Items]
Long-term debt		$ 51,000,000
A&R CDA
Debt Instrument [Line Items]
Long-term debt				$ 124,200,000
Term Loan
Debt Instrument [Line Items]
Interest rate				8.00%	8.25%
Premium/(Discount), Debt				$ (2,700,000)	$ (4,300,000)
Long-term debt				627,200,000	669,000,000
Debt Instrument, Gross, Current Maturities				6,700,000	7,000,000
Current maturities				(6,700,000)	(7,000,000)
Premium/(Discount), Current Maturities				$ 0	$ 0
Effective Interest Rate				8.20%	8.45%
Aggregate principal amount				$ 638,500,000	$ 686,000,000
Term Loan | Book Value
Debt Instrument [Line Items]
Fair value of long term debt				627,200,000	669,000,000
Term Loan | Fair Value
Debt Instrument [Line Items]
Fair value of long term debt				638,100,000	594,600,000
Term Loan | 2014 Financing [Member]
Debt Instrument [Line Items]
Principal amount issued				700,000,000
2014 Term Loan [Member] | 2014 Financing [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount Discount Percent		1.00%
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]
Premium/(Discount), Debt				0	0
Long-term debt				0	0
Line Of Credit Facility, Total Cash and Availability				89,000,000	79,700,000
Line Of Credit Facility, Total Able to Be Drawn				44,400,000	35,500,000
Aggregate principal amount				$ 0	$ 0
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 [Member]
Debt Instrument [Line Items]
Principal amount issued		$ 450,000,000
Senior Notes | Senior B Notes [Domain]
Debt Instrument [Line Items]
Principal amount issued										$ 100,000,000.0
Interest rate										10.00%
Series B Notes Outstanding Principal and Interest								17,900,000
Debt Instrument, Convertible, Conversion Price | $ / shares								$ 18.00
Common Stock shares converted from Series B Notes								994,689
Exchange/conversion of Series B Notes to common stock						$ 1,200,000
Issuance of equity upon conversion of 6% convertible senior notes | shares						75,900
Debt interest expense						$ 400,000
Make whole premium						200,000
Accelerated amortization of the discount						$ 200,000
Expense Related to Fair Value of Incremental Shares Converted					$ 600,000
Cash Repayment to Series B Notes holders							300,000
Senior Notes | Senior B Notes
Debt Instrument [Line Items]
Conversion price, future period | $ / shares			$ 15.00
Debt Instrument, Convertible, Conversion Ratio, Future Period				0.0539567
Debt Instrument, Convertible, Conversion Ratio				0.0566695
Exchange/conversion of Series B Notes to common stock		50,600,000
Make Whole Interest Expense					8,000,000
Senior Notes | 6% Senior Convertible Notes
Debt Instrument [Line Items]
Interest rate				0.00%
Senior Notes | Unsecured Second A&R CDA
Debt Instrument [Line Items]
Exchange/conversion of Series B Notes to common stock		50,600,000
Long-term debt		73,200,000
Lease Financing Obligation
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five				$ 234,000,000
Aggregate principal amount				269,900,000
Long Term Debt, Principal Cash Obligation, After Year Five				11,200,000
Net Book Value Of Assets				222,800,000
Secured Second A&R CDA
Debt Instrument [Line Items]
Premium/(Discount), Debt				0	0
Long-term debt				$ 28,100,000	$ 44,400,000
Effective Interest Rate				7.50%	7.30%
Aggregate principal amount				$ 28,700,000	$ 44,700,000
Secured Second A&R CDA | Maximum
Debt Instrument [Line Items]
Interest rate				18.30%	18.30%
Secured Second A&R CDA | Minimum
Debt Instrument [Line Items]
Interest rate				3.30%	3.30%
Letter of Credit [Member] | ABL Facility
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				$ 357,200,000	$ 362,000,000
Lease financing obligations
Debt Instrument [Line Items]
Premium/(Discount), Debt				0	0
Long-term debt				268,600,000	276,300,000
Debt Instrument, Gross, Current Maturities				10,100,000	8,900,000
Current maturities				(10,100,000)	(8,900,000)
Premium/(Discount), Current Maturities				$ 0	$ 0
Effective Interest Rate				12.00%	12.00%
Aggregate principal amount				$ 269,900,000	$ 278,000,000
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%	10.00%
Lease financing obligations | Book Value
Debt Instrument [Line Items]
Fair value of long term debt				$ 268,600,000	$ 276,300,000
Lease financing obligations | Fair Value
Debt Instrument [Line Items]
Fair value of long term debt				259,100,000	282,900,000
Other | Book Value
Debt Instrument [Line Items]
Fair value of long term debt				101,300,000	117,100,000
Other | Fair Value
Debt Instrument [Line Items]
Fair value of long term debt				101,800,000	102,100,000
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Premium/(Discount), Debt				0	0
Long-term debt				$ 73,200,000	$ 72,700,000
Effective Interest Rate				7.50%	7.30%
Aggregate principal amount				$ 73,200,000	$ 73,200,000
Unsecured Second A&R CDA | Maximum
Debt Instrument [Line Items]
Interest rate				18.30%	18.30%
Unsecured Second A&R CDA | Minimum
Debt Instrument [Line Items]
Interest rate				3.30%	3.30%
Restructured Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal after Year Five				$ 0
Aggregate principal amount				$ 638,500,000
2014 Financing [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Common Stock		215,000,000
Increase (Decrease) in Restricted Cash		90,000,000
Uses of Funds		1,040,000,000
Non Cash Sources of Funds		174,800,000
Non Cash Uses of Funds		174,800,000
2014 Financing [Member] | 6% Notes [Member]
Debt Instrument [Line Items]
Repayment of long-term debt		71,500,000
2014 Financing [Member] | ABL Facility
Debt Instrument [Line Items]
Increase (Decrease) in Restricted Cash		92,000,000
2014 Financing [Member] | ABL Facility
Debt Instrument [Line Items]
Repayment of long-term debt		326,000,000
2014 Financing [Member] | Series A Note
Debt Instrument [Line Items]
Repayment of long-term debt			$ 90,900,000
Future Repayments of Series A Notes	$ 89,600,000		$ 89,600,000
2014 Financing [Member] | 2014 ABL Facility Credit Agreement [Member] [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt		0
Cash, Period Increase (Decrease)		16,500,000
2014 Financing [Member] | Restructured Term Loan [Member]
Debt Instrument [Line Items]
Repayment of long-term debt		299,700,000
2014 Financing [Member] | Term Loan
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt		$ 700,000,000
LIBOR | Term Loan | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				7.25%	7.25%
LIBOR | Term Loan | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				7.00%	7.00%
LIBOR | 2014 Term Loan [Member] | 2014 Financing [Member]
Debt Instrument [Line Items]
Variable rate basis, option two, minimum variable rate basis				1.00%
Basis spread on variable rate				6.50%
Higher of London Interbank Offer Rate or 1.00% [Member] | 2014 Term Loan [Member] | 2014 Financing [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				7.50%
ABL Base Rate [Domain] | ABL Facility
Debt Instrument [Line Items]
Basis spread on variable rate				0.75%
Common Stock [Member]
Debt Instrument [Line Items]
Stock Issued During Period, Shares, New Issues | shares			14,333,334	0	0	14,333,000
Issuance of equity upon conversion of 6% convertible senior notes | shares				0	995,000	3,471,000
Preferred Stock [Member]
Debt Instrument [Line Items]
Stock Issued During Period, Shares, New Issues | shares			583,334	0	0	583,000
Issuance of equity upon conversion of 6% convertible senior notes | shares				0	0	0
ABL Facility
Debt Instrument [Line Items]
Line Of Credit Facility, Total Cash and Availability				$ 181,100,000	$ 209,300,000
Credit Agreement Amendment, September 2014 [Member]
Debt Instrument [Line Items]
Total Leverage Ratio				3.40