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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 15, 2018
Unvested Restricted Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares) 7.2 7.0  
Convertible Debt Securities      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares)   13.8  
Warrant      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities (shares)   10.8  
Convertible Senior Notes Due June 2018 | Convertible notes payable      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Principal     $ 316.3
Interest rate     2.75%
Maximum number of convertible instruments (shares)   3.0