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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2011
Restricted stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities | 6.4 | 5.2 | 4.3 |
Convertible debt securities |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities |  | 13.8 |  |
Warrants |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities | 0.5 | 10.8 | 10.8 |
Convertible debt |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Principal amount |  | $ 316.3 |  |
Convertible debt | Convertible Senior Notes Due June 2018 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Principal amount |  |  |  | $ 316.3
Interest rate |  |  |  | 2.75%
Maximum number of equity instruments |  | 3.0 | 3.0 |
Convertible debt | Convertible Senior Notes Due June 2018 | Convertible debt securities |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities |  |  | 13.8 |

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