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Long-Term Debt - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
2017/2018 Senior Notes due December 2025 | Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percent) |  | 100.00%
2017/2018 Senior Notes due December 2025 | Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percent) |  | 106.75%
Principal amount redeemed (as a percent) |  | 40.00%
2017/2018 Senior Notes due December 2025 | Period Two | Minimum |  |
Debt Instrument [Line Items] |  |
Call premium (as a percent) |  | 0.00%
2017/2018 Senior Notes due December 2025 | Period Two | Maximum |  |
Debt Instrument [Line Items] |  |
Call premium (as a percent) |  | 5.063%
Senior Notes | 2017/2018 Senior Notes due December 2025 |  |
Debt Instrument [Line Items] |  |
Principal amount of debt instrument |  | $ 1,000,000,000.00
Stated interest rate (as a percent) |  | 6.75%
Senior Notes | 2013 Senior Notes due March 2018 and March 2023 |  |
Debt Instrument [Line Items] |  |
Repayments of debt | $ 250,000,000 |
Senior Notes | 2018 Senior Notes due December 2025 |  |
Debt Instrument [Line Items] |  |
Principal amount of debt instrument |  | $ 500,000,000.0
Stated interest rate (as a percent) |  | 6.75%

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