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Earnings per Share - Dilutive and Antidilutive securities (Details)
shares in Thousands, instrument in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
shares
Sep. 30, 2016
shares
Sep. 30, 2017
USD ($)
instrument
shares
Sep. 30, 2016
shares
Antidilutive securities and effect of dilutive securities        
Effect of dilutive securities - Convertible Notes (in shares) | shares 2,313 3,445 2,284 3,766
2017 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes are less than principal amount     $ 38.5  
Effect of dilutive securities - Convertible Notes (in shares) | shares     0  
2018 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     $ 16.4  
2019 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     34.6  
2023 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes are less than principal amount     $ 40.4  
Effect of dilutive securities - Convertible Notes (in shares) | shares     0  
Convertible Senior Notes        
Antidilutive securities and effect of dilutive securities        
Potential shares of common stock contingently issuable upon conversion of the Convertible Notes | instrument     61.9  
Shares excluded from diluted EPS calculations | shares     59,600  
Convertible Senior Notes | 2018 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     $ 16.4  
Convertible Senior Notes | 2019 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     $ 34.6  
Restricted stock        
Antidilutive securities and effect of dilutive securities        
Number of anti-dilutive common shares excluded from the calculation of diluted income per share | shares     1,600 900