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Subsequent Events - Early Redemption of Senior Notes (Details) - USD ($) | Feb. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 6.65% | 6.65%
6.65% Senior notes, due May 2018 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Senior debt, called for redemption | $ 500,000,000 |  |
Redemption price, percentage | 100.00% |  |
6.65% Senior notes, due May 2018 | Fixed interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 6.65% |  |
Basis spread on variable rate | 0.45% |  |

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