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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
3 Months Ended
Jun. 03, 2019
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
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    
Use of proceeds repayment of long term debt     $ 232,700,000          
Payments on long-term debt   $ 94,909,000 221,100,000 $ 0        
Unwind transactions (in shares) | shares   1.3            
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
Initial strike price (in USD per share) | $ / shares   $ 86.10