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Long-term Debt - Textual (Details)		1 Months Ended													3 Months Ended				12 Months Ended
	Sep. 29, 2017 USD ($)	May 31, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	May 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Nov. 30, 2013 USD ($) shares	Oct. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 shares	May 31, 2016 USD ($)	Dec. 31, 2013	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Sep. 01, 2019	Jul. 01, 2017	May 01, 2017	Oct. 31, 2015 USD ($)	Sep. 11, 2012
Debt Instrument [Line Items]
Loss on early extinguishment of debt																			$ 10,700,000	$ 7,400,000	$ 22,400,000
Senior secured leverage ratio maximum															2				2
Repayments made on debt																			$ 129,900,000	202,100,000	597,400,000
Conversion of convertible debt																			$ 319,400,000	$ 0	$ 0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares																			4,000,000	8,500,000	8,300,000
Capital Lease Obligations [Member] | Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)															2.00%				2.00%
Capital Lease Obligations [Member] | Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)															11.00%				11.00%
Term Loan Facilities [Member]
Debt Instrument [Line Items]
Maximum leverage ratio under the financial covenants															4.50				4.50
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price, (percent)																			101.00%
Convertible Preferred Stock [Member]
Debt Instrument [Line Items]
Shares exchanged for convertible debt (shares) | shares												257,110
Convertible debt dividend rate (percent)												6.50%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments made on debt														$ 195,000,000
Term Loan Facilities [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Repayments made on debt										$ 250,000,000
Repayments of Debt	$ 110,000,000
The 2015 & 2016 Credit Agreement [Member] [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity																				$ 500,000,000
Percentageof aggregate principal amount outstanding (percent)									1.25%
Senior secured leverage ratio maximum															1.75				1.75
Maximum leverage ratio under the financial covenants																				4.50			4.25
Proceeds from credit facility							$ 125,000,000
Remaining capacity under credit facility																									$ 125,000,000
The 2015 & 2016 Credit Agreement [Member] [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity																				$ 260,000,000
The 2015 & 2016 Credit Agreement [Member] [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity																				$ 600,000,000
5.75% Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount							350,000,000
Net proceeds for offering							$ 344,000,000
Debt instrument maturity date							Sep. 15, 2025
Effective interest rate (percent)							6.00%
Debt instrument interest rate (percent)					5.75%										5.75%				5.75%	5.75%
The Credit Agreement [Member]
Debt Instrument [Line Items]
Amounts outstanding under letter of credit facility															$ 35,400,000				$ 35,400,000	$ 33,300,000
The Credit Agreement [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 300,000,000
Percentageof aggregate principal amount outstanding (percent)															1.25%				1.25%
Commitment fee (percent)	0.375%
Senior secured leverage ratio maximum	2.00
Payment limit under the credit agreement's negative covenant																			$ 200,000,000
The Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Spread on variable rate (percent)	0.50%														1.50%
The Credit Agreement [Member] | Scenario, Forecast [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Maximum leverage ratio under the financial covenants																						4.25
The Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 260,000,000
The Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 700,000,000
Applicable interest rate under credit facility (percent)															3.10%				3.10%	2.70%
7.25% and 7.75% Senior Notes due 2018 and 2022, Respectively [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments made on debt													$ 64,500,000
5.75% Senior Notes Due 2024 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount								$ 350,000,000		$ 400,000,000	$ 175,000,000			275,000,000
Debt issue price as percentage of principal (percent)								100.50%		102.00%	103.625%
Net proceeds for offering								$ 351,000,000		$ 406,000,000	$ 182,000,000			$ 270,000,000
Debt instrument maturity date																		Nov. 01, 2024
Effective interest rate (percent)																										5.80%
Debt instrument interest rate (percent)															5.75%				5.75%	5.75%						5.75%
Former 2022 Notes | Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price, (percent)			102.583%			103.875%											103.875%
Repayments made on debt			$ 78,000,000			$ 52,000,000											$ 104,000,000
Debt redeemed			$ 76,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000
Effective interest rate (percent)			7.90%
5.125% Senior Notes Due 2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount									$ 300,000,000
Net proceeds for offering									$ 295,000,000
Effective interest rate (percent)									5.40%
Debt instrument interest rate (percent)					5.125%										5.125%				5.125%	5.125%
Senior Notes; Due 2020 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price, (percent)									104.063%
Repayments made on debt									$ 302,000,000
Debt redeemed									$ 290,000,000
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount												$ 320,000,000
Effective interest rate (percent)																								6.00%
Debt instrument interest rate (percent)															2.00%				2.00%	2.00%
Debt instrument conversion rate		27.2221 shares per $1,000 principal amount
Conversion of convertible debt		$ 319,400,000
Conversion of convertible debt, net of tax (shares) | shares		8,900,000
Stock Issued During Period, Shares, Conversion of Convertible Securities Due to Make-Whole Premium | shares		200,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares																8,600,000
Repayments of Debt		$ 600,000

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