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Debt - Details of Notes (Details)
shares in Millions
1 Months Ended
May 01, 2020
shares
May 31, 2020
$ / shares
shares
Aug. 31, 2018
$ / shares
shares
2023 Notes | Call Option      
Debt Instrument [Line Items]      
Option indexed to issuer's equity (in shares)     5.5
2023 Notes | Convertible Debt      
Debt Instrument [Line Items]      
Conversion ratio (in shares per $1000)     0.024046
Conversion price (in dollars per share) | $ / shares     $ 41.59
2023 Notes | Convertible Debt | Call Option      
Debt Instrument [Line Items]      
Option indexed to issuer's equity (in shares)     5.5
2025 Notes | Call Option      
Debt Instrument [Line Items]      
Option indexed to issuer's equity (in shares) 3.8    
2025 Notes | Convertible Debt      
Debt Instrument [Line Items]      
Conversion ratio (in shares per $1000)   0.0163875  
Conversion price (in dollars per share) | $ / shares   $ 61.02  
2025 Notes | Convertible Debt | Call Option      
Debt Instrument [Line Items]      
Option indexed to issuer's equity (in shares)   3.8