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Fair Value Measurements - Narratives (Details) - USD ($)
Mar. 31, 2022
Jan. 14, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Restricted cash $ 8,500,000    
Amortized cost of available-for-sale investments with maturities less than one year 1,311,800,000   $ 966,300,000
Amortized cost of available-for-sale investments with maturities greater than one year 274,100,000   544,400,000
Net unrealized gains (loss) on investments, net of tax (12,700,000)   2,700,000
Vectrix, Inc.      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Consideration held back   $ 1,300,000  
Convertible Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, fair value 536,000,000    
Convertible Debt | 2026 Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt instrument, fair value 1,324,200,000    
Money market funds      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unrealized gain 0   0
Unrealized loss 0   $ 0
Standby Letters of Credit      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Restricted cash $ 6,700,000