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Long-term Debt - Convertible Note Hedges and Warrants (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Sep. 11, 2018
Jun. 30, 2019
Debt Instrument [Line Items]    
Expiration period for Notes Warrants in trading days   100 days
Convertible Note Hedges | Convertible Senior Notes Due 2023    
Debt Instrument [Line Items]    
Conversion option to acquire shares (in shares) 3.8  
Strike price (in dollars per share) $ 37.60  
Cost of purchase of hedges on convertible notes $ 20.7  
Deferred tax amount, hedges 5.3  
Convertible Debt | Convertible Senior Notes Due 2023    
Debt Instrument [Line Items]    
Debt discount for conversion option 20.9  
Warrant | Convertible Senior Notes Due 2023    
Debt Instrument [Line Items]    
Warrant exercise price (in dollars per share)   $ 46.62
Warrant | Convertible Debt    
Debt Instrument [Line Items]    
Proceeds from issuance of warrants on convertible notes $ 12.1