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Debt (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Loss (gain) on debt extinguishment |  | $ (2,600,000) | $ 260,800,000 |
Amortization of Debt Discount (Premium) |  | (6,500,000) | $ (11,200,000) |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  | 237,600,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  | 450,900,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  | $ 269,700,000 |  |
8.50% Senior notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.50% |  | 8.50%
6.875% Senior notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.875% |  | 6.875%
4.70% Senior notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.70% |  | 4.70%
8.00% Senior notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss (gain) on debt extinguishment | $ 6,200,000 |  |  |
Revolving Credit Facility [Member] | Five Year Credit Facility Member |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 2,250,000,000 |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.225% |  |
Maximum Percent of Debt to Total Capitalization Ratio |  | 60.00% |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 500,000,000 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 0 |  | $ 0
Revolving Credit Facility [Member] | Credit Facility due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 1,120,000,000 |  |
Revolving Credit Facility [Member] | Credit Facility due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 1,130,000,000 |  |
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |
Five Year Credit Facility Member |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | $ 0 |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amortization of Debt Discount (Premium) | 3,500,000 |  |  |
Amortization of Debt Issuance Costs | $ 2,700,000 |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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