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Debt - Estimated Fair Values of Long-term Debt (Details) - Senior Notes - USD ($) $ in Millions | Dec. 31, 2017 | May 08, 2017 | Dec. 31, 2016
--- | --- | --- | ---
10.75% senior secured notes due April 15, 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 10.75% |  |
5.50% convertible senior notes due March 1, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 5.50% |  | 5.50%
6.25% senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 6.25% | 6.25% |
Estimated Fair Value | 10.75% senior secured notes due April 15, 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 492.8 |  | $ 0.0
Estimated Fair Value | 5.50% convertible senior notes due March 1, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 237.9 |  | 379.8
Estimated Fair Value | 6.25% senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 0.0 |  | $ 97.8

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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