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Debt - 2024 Notes (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 28, 2015 | Mar. 31, 2014 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2014 | Mar. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 11,900,000 | $ 0 | $ 0 |  |
Loss on extinguishment of debt |  |  | $ (21,200,000) | $ 21,200,000 | $ 0 | $ 14,300,000 |  |
Senior notes | 2024 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 325,000,000 |  |  |  |  |  |
Debt issuance costs |  | $ 3,900,000 |  |  |  |  |  |
Senior notes | 2024 Notes | Prior to March 15, 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  |  | 100.00% |  |  |  |
Senior notes | 2018 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt redeemed |  |  |  |  |  |  |  | $ 280,000,000
Senior notes | 2020 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of debt redeemed |  |  |  |  |  |  | $ 245,000,000 |
Percentage of debt redemption | 104.063% | 10.00% |  |  |  |  |  |
Repayments of debt |  | $ 35,000,000 |  |  |  |  |  |

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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