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Convertible Senior Notes (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
day
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Repayments of convertible senior notes           $ 300,751,000 $ 0    
Proceeds from exercise of convertible senior notes capped call           69,004,000 0    
Loss on early extinguishment of debt       $ 0 $ 0 78,152,000 $ 0    
Equity component of convertible senior notes, net of issuance costs       (225,615,000)   (236,920,000)      
Equity component of convertible senior notes, net of issuance costs       (225,615,000)   $ (236,920,000)      
Senior Notes | Sale Price Is Greater Or Equal 130%                  
Debt Instrument [Line Items]                  
Threshold trading days | day           20      
Threshold consecutive trading days | day           30      
Threshold percentage of stock price trigger           130.00%      
Senior Notes | Trading Price Per $1,000 Principal Amount Less Than 98%                  
Debt Instrument [Line Items]                  
Threshold trading days | day           5      
Threshold consecutive trading days | day           10      
Senior Notes | Trading Price Per $1,000 Principal Amount Less Than 98% | Maximum                  
Debt Instrument [Line Items]                  
Threshold percentage of stock price trigger           98.00%      
Senior Notes | 0% Convertible Senior Notes Due 2026                  
Debt Instrument [Line Items]                  
Face value $ 1,000,000,000.0     $ 1,000,000,000   $ 1,000,000,000   $ 1,000,000,000  
Interest rate, stated percentage 0.00%                
Proceeds from issuance of debt $ 1,000,000,000                
Less initial purchasers’ discount (15,000,000)                
Less other issuance costs (904,000)                
Net proceeds $ 984,096,000                
Conversion ratio 0.0092978                
Conversion price | $ / shares       $ 107.55   $ 107.55      
Senior Notes | 0% Convertible Senior Notes Due 2026 | Capped Call                  
Debt Instrument [Line Items]                  
Net proceeds $ 103,400,000                
Conversion price | $ / shares       $ 156.44   $ 156.44      
Senior Notes | 0% Convertible Senior Notes Due 2026, Additional Notes                  
Debt Instrument [Line Items]                  
Face value $ 100,000,000                
Senior Notes | 0.125% Convertible Senior Notes Due 2025                  
Debt Instrument [Line Items]                  
Face value   $ 100,000,000   $ 699,992,000   $ 699,992,000   800,000,000 $ 700,000,000
Interest rate, stated percentage                 0.125%
Proceeds from issuance of debt   800,000,000              
Less initial purchasers’ discount   (18,998,000)              
Less other issuance costs   (822,000)              
Net proceeds   $ 780,180,000              
Repurchased principal amount       100,000,000.0   100,000,000.0      
Repayments of convertible senior notes           184,900,000      
Carrying amount       98,300,000   98,300,000      
Derivative liability       $ 176,500,000   176,500,000      
Gain (loss) in change in fair value           (8,400,000)      
Loss on early extinguishment of debt           $ 78,200,000      
Conversion ratio   0.0193956              
Conversion price | $ / shares       $ 51.56   $ 51.56      
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call                  
Debt Instrument [Line Items]                  
Net proceeds   $ 97,200,000              
Debt instrument, convertible, shares terminated (in shares) | shares           1,939,560      
Proceeds from exercise of convertible senior notes capped call           $ 23,900,000      
Derivative liability       $ 22,600,000   22,600,000      
Gain (loss) in change in fair value           $ 1,300,000      
Conversion price | $ / shares       $ 79.32   $ 79.32      
Senior Notes | 0.25% Convertible Senior Notes Due 2023                  
Debt Instrument [Line Items]                  
Face value     $ 345,000,000         115,576,000  
Interest rate, stated percentage     0.25%            
Proceeds from issuance of debt     $ 345,000,000            
Option to purchase additional notes     45,000,000            
Less initial purchasers’ discount     (8,625,000)            
Less other issuance costs     (757,000)            
Net proceeds     $ 335,618,000            
Conversion ratio     0.0371051            
Conversion price | $ / shares       $ 26.95   $ 26.95      
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Settlement Of Principal During Three Months                  
Debt Instrument [Line Items]                  
Repurchased principal amount       $ 110,900,000   $ 110,900,000      
Aggregate consideration       335,200,000          
Repayments of convertible senior notes       $ 110,900,000          
Debt conversion, shares issued (in shares) | shares       2,857,008          
Debt conversion, shares issued, value       $ 224,300,000          
Carrying amount       109,600,000   109,600,000      
Equity component of convertible senior notes, net of issuance costs       225,600,000          
Equity component of convertible senior notes, net of issuance costs       225,600,000          
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Settlement Of Principal During Six Months                  
Debt Instrument [Line Items]                  
Repurchased principal amount       115,600,000   115,600,000      
Aggregate consideration           351,100,000      
Repayments of convertible senior notes           $ 115,600,000      
Debt conversion, shares issued (in shares) | shares           2,983,011      
Debt conversion, shares issued, value           $ 235,500,000      
Carrying amount       $ 114,200,000   114,200,000      
Equity component of convertible senior notes, net of issuance costs           236,900,000      
Equity component of convertible senior notes, net of issuance costs           $ 236,900,000      
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call | Settlement Of Principal During Three Months                  
Debt Instrument [Line Items]                  
Debt instrument, convertible, shares terminated (in shares) | shares       4,201,633          
Proceeds from exercise of convertible senior notes capped call       $ 44,200,000          
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call | Settlement Of Principal During Six Months                  
Debt Instrument [Line Items]                  
Debt instrument, convertible, shares terminated (in shares) | shares           4,288,459      
Proceeds from exercise of convertible senior notes capped call           $ 45,200,000      
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Exchange Of Aggregate Principal Amount                  
Debt Instrument [Line Items]                  
Repurchased principal amount               $ 172,000,000.0  
Repayments of convertible senior notes           $ 174,600,000      
Debt conversion, shares issued (in shares) | shares           4,182,320      
Debt conversion, shares issued, value           $ 327,100,000      
Aggregate consideration for principal amount exchanged           501,700,000      
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Requests For Conversions                  
Debt Instrument [Line Items]                  
Repurchased principal amount       24,700,000   24,700,000      
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Election Of Option To Redeem Outstanding Notes                  
Debt Instrument [Line Items]                  
Repurchased principal amount       $ 90,900,000   $ 90,900,000