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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 Excluded from Computation of Earnings Per Share 5.5 4.5 5.4 4.2    
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   $ 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   $ 316.3     $ 316.3
Interest rate 2.75%   2.75%     2.75%