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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jun. 30, 2011
Unvested Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (shares) 7.0 5.2    
Convertible Debt Securities [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (shares) 13.8 13.8    
Warrant [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (shares) 10.8 10.8    
Convertible Debt [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Principal $ 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
Interest rate       2.75%
Maximum number of convertible instruments (shares) 3.0