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Fair Value Measurements - Additional Information (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities contractual maturities $ 291.5
Marketable securities 1,500.0
Level 2 Securities | 2027 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes 1,300.0
Level 2 Securities | 2025 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes 968.9
Level 2 Securities | 2026 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes $ 2,700.0
Minimum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities contractual maturities period 1 year
Maximum  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Marketable securities contractual maturities period 5 years