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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2018 | Feb. 28, 2018 | Feb. 09, 2018 | Feb. 07, 2018 | Oct. 31, 2017 | Sep. 30, 2017 | Jan. 05, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |
Tender Offer |  |  |  |  |  |  |  | $ 985,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 721,800,000 |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 771,200,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 65,550,000 |  | 1,822,432 |  |  |  |  |  | 1,822,432 |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 6,200,000 |  |  |  | (19,000,000) | $ (2,600,000) | $ 287,800,000 |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  | 282,700,000 | 224,200,000 | 228,800,000 |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  | $ 62,600,000 | $ 72,500,000 | 45,700,000 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Debentures Due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
3.00% Exchangeable senior notes due 2024(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
5.20% Senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 5.20% |  |  |  |  |  |  |  |  |  |
5.75% Senior notes due 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2044 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |
4.50% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |
4.70% Senior notes due 2021(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2021 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |
6.875% Senior notes due 2020(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 328,000,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | $ 354,700,000 |  |  |  |  |  |  |  |  |  |
8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 237,600,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | $ 256,800,000 |  |  |  |  |  |  |  |  |  |
7.875% Senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2040 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 7.875% |  |  |  |  |  |  |  |  |  |
7.20% Senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 7.20% |  |  |  |  |  |  |  |  |  |
8.00% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Open Market Repurchases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 194,100,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 204,500,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  | $ 2,000,000,000 |  |  |  |  | 2,000,000,000 | $ 2,000,000,000 |  |  |  |  |  |  | $ 2,250,000,000 |  |
Potential_Additional_Revolver_Capacity |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |
Maximum Percent of Debt to Total Capitalization Ratio |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 0 |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Debt Covenant, Additional Secured Debt, Value |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |
Debt Covenant, Aggregate Amount Of Available Cash |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Facility due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  | $ 1,130,000,000 |  |
Revolving Credit Facility [Member] | Credit Facility due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |
Debt Covenant, Period For Repayment Of Acquired Companies |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |
Debt Covenant, Aggregate Amount Of Available Cash, After Repayments |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Excluding Amortization |  |  |  |  |  |  |  | 25,500,000 | $ 25,500,000 |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  | 31,000,000 | 31,400,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 849,500,000 |  |  |  |  | $ 849,500,000 | 849,500,000 |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |
Conversion rate per $1,000 principal amount of shares |  |  |  |  |  |  |  | 71.3343 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  | $ 14.02 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 194,100,000 |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204,500,000 |
Senior Notes [Member] | 7.75% Senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 7.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 5.20% Senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 5.20% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 5.75% Senior notes due 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400,000,000 |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  | 2044 |  |  |  |  |  | 2044 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 5.75% |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  | $ 18,700,000 |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 24,500,000 |  |  |  |  |  | 24,500,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | 8,800,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 4.50% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  |  |  |  |  |  |  |  | $ 850,000 |  |  |  |  |  |  |
Senior Notes [Member] | 4.70% Senior notes due 2021(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2021 | 2021 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  |  |  |  | $ 29,600,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 156,200,000 | 413,300,000 |  |  |  |  | $ 156,200,000 | 413,300,000 |  |  |  |  |  |  |  | 39,400,000 |
Debt Instrument, Repurchase Amount |  | 159,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,300,000 |
Senior Notes [Member] | 6.875% Senior notes due 2020(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  | 2020 | 2020 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 229,900,000 |  |  |  |  | 328,000,000 | $ 229,900,000 |  |  |  | $ 71,400,000 |  | $ 256,600,000 |  | 100,100,000 |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,100,000 |
Senior Notes [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  | 2019 |  | 2019 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 200,400,000 |  |  |  |  | 237,600,000 | $ 200,400,000 |  |  |  | $ 55,000,000 | $ 182,600,000 |  |  | 54,600,000 |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,100,000 |
Senior Notes [Member] | 7.875% Senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  | 2040 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 7.875% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 7.20% Senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 150,000,000 |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 7.20% |  |  |  |  |  | 7.20% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 8.00% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 332,000,000 |  |  |  |  | $ 332,000,000 | $ 332,000,000 |  |  |  |  |  |  |  |  |
Senior Note Maturity Year |  |  |  |  |  |  |  | 2024 | 2024 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 8.00% |  |  |  |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |
Exchange Offers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Discount (Premium) |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Offers [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 649,500,000
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 664,500,000
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 373,900,000
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 362,500,000
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,800,000
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,700,000
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,800,000
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,300,000
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 332,000,000

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