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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2011
Unvested Restricted Stock            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive securities (shares) 6.2 5.3 6.5 5.3    
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)     9.2 10.8    
Convertible notes payable            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Principal         $ 316.3  
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