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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Unvested Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share 5.2 3.9  
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
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%