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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

X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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.

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