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Long-Term Debt - 2024 and 2020 Senior Convertible Notes, and Related Note Hedge and Warrant Transactions (Details)
$ / shares in Units, shares in Millions
9 Months Ended
Jun. 03, 2019
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Mar. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2019
$ / shares
shares
Mar. 11, 2015
USD ($)
Mar. 09, 2015
shares
Debt Instrument [Line Items]              
Initial strike price (in USD per share) | $ / shares         $ 109.43    
Convertible Notes 2020              
Debt Instrument [Line Items]              
Unamortized debt discount and issuance costs     $ 94,900,000        
Convertible Debt              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 400,000,000   $ 494,909,000      
Convertible Debt | Convertible Notes 2024              
Debt Instrument [Line Items]              
Aggregate principal amount $ 400,000,000.0 400,000,000   400,000,000      
Debt instrument interest rate, stated percentage 2.00%            
Transaction fees and offering expenses $ 391,600,000            
Initial conversion rate 12.3018            
Debt conversion converted instrument amount $ 1,000 $ 1,000          
Initial conversion price (in USD per share) | $ / shares $ 81.29            
Convertible note hedge (in shares) | shares         4.9    
Anti-dilution adjustments of common stock (in shares) | shares         4.9    
Convertible Debt | Convertible Notes 2020              
Debt Instrument [Line Items]              
Aggregate principal amount       $ 94,909,000   $ 316,000,000.0  
Debt instrument interest rate, stated percentage           1.50%  
Convertible note hedge (in shares) | shares             4.4
Anti-dilution adjustments of common stock (in shares) | shares             4.4