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Convertible Senior Notes - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 25, 2020
USD ($)
day
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Proceeds from issuance of convertible senior notes, net of issuance costs     $ 0 $ 559,665,000  
Debt issuance costs incurred and capitalized     0 550,000  
Purchase of convertible note hedge $ 100,600,000 $ 100,625,000      
Proceeds from sale of warrants 51,300,000   0 $ 51,290,000  
Convertible Note Hedge          
Debt Instrument [Line Items]          
Deferred tax asset related to the convertible note hedge transaction $ 25,800,000        
Convertible Note Hedge Rights          
Debt Instrument [Line Items]          
Options and warrants to purchase shares (in shares) | shares 5,900,000        
Strike price (in dollars per share) | $ / shares $ 97.32        
Warrants          
Debt Instrument [Line Items]          
Options and warrants to purchase shares (in shares) | shares 5,900,000        
Strike price (in dollars per share) | $ / shares $ 141.56        
Convertible Senior Notes | Convertible Debt          
Debt Instrument [Line Items]          
Interest rate 0.25%        
Aggregate principal amount $ 575,000,000        
Additional principal amount subject to purchasers' option 75,000,000        
Proceeds from issuance of convertible senior notes, net of issuance costs 559,700,000        
Debt issuance costs incurred and capitalized $ 15,300,000        
Conversion ratio 0.0102751        
Conversion price (in dollars per share) | $ / shares $ 97.32        
Repurchase price as a percent of principal amount 100.00%        
Aggregate principal amount of Notes that must be outstanding and not subject to redemption if the Company redeems less than all of the Notes $ 150,000,000        
Carrying value of debt 461,800,000   482,822,000   $ 467,201,000
Equity component of convertible senior notes $ 72,700,000   $ 72,732,000   $ 72,732,000
Effective interest rate     4.18%    
Remaining life of debt discount and issuance cost accretion     4 years    
Maximum number of shares issuable upon conversion (in shares) | shares 8,100,000        
Excess principal amount over the if-converted value     $ 302,000,000    
Convertible Senior Notes | Convertible Debt | Period 1          
Debt Instrument [Line Items]          
Threshold trading days | day 20        
Threshold consecutive trading days | day 30        
Threshold percentage of stock price trigger 130.00%        
Convertible Senior Notes | Convertible Debt | Period 2          
Debt Instrument [Line Items]          
Threshold trading days | day 5        
Threshold consecutive trading days | day 10        
Threshold percentage of stock price trigger 98.00%