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Earnings per Share - Dilutive and Antidilutive securities (Details)
shares in Thousands, instrument in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
shares
Jun. 30, 2016
shares
Jun. 30, 2017
USD ($)
instrument
shares
Jun. 30, 2016
shares
Antidilutive securities and effect of dilutive securities        
Effect of dilutive securities - Convertible Notes (in shares) | shares 3,142 441 3,128 456
2017 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes are less than principal amount     $ 27.0  
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     $ 26.0  
2019 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     $ 44.3  
Effect of dilutive securities - Convertible Notes (in shares) | shares     3,100  
2023 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes are less than principal amount     $ 34.0  
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     61.7  
Shares excluded from diluted EPS calculations | shares     58,600  
Amount by which if-converted value of the Notes exceed principal amount     $ 5.9  
Convertible Senior Notes | 2018 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     26.0  
Convertible Senior Notes | 2019 Notes        
Antidilutive securities and effect of dilutive securities        
Amount by which if-converted value of the Notes exceed principal amount     $ 44.3  
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     1,700 1,200