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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2011
Unvested Restricted Stock [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share | 5.5 | 4.5 | 5.4 | 4.2 |  |
Convertible Debt Securities [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  | 13.8 | 13.8 |  |
Debt Instrument Convertible Maximum Number Of Equity Instrument |  |  | 3.0 |  |  |
Warrant [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  | 10.8 | 10.8 |  |
Convertible Debt [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Principal | $ 316.3 |  | $ 316.3 |  | $ 316.3 |
Convertible Senior Notes Due June 2018 [Member] | Convertible Debt [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Principal | $ 316.3 |  | $ 316.3 |  |  | $ 316.3
Interest rate | 2.75% |  | 2.75% |  |  | 2.75%

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- Definition The maximum number of equity instruments that the holder of the debt instrument would receive in excess of the amount of principal that would be settled in cash if the debt was converted to equity. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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