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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jun. 30, 2011
Unvested Restricted Stock [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive securities (shares) 5.3 4.7 5.3 4.6    
Convertible Debt Securities [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive securities (shares)     13.8 13.8    
Maximum number of convertible instruments (shares)     3.0      
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   $ 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%