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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 15, 2018
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities 7.5 6.4 5.2  
Convertible debt securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities     13.8  
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities   0.5 10.8  
Convertible debt | Convertible Senior Notes Due June 2018        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Principal amount       $ 316.3
Interest rate       2.75%
Maximum number of equity instruments     3.0