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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities, fair value $ 101.5 $ 91.5
Marketable securities contractual maturities 795.9  
Marketable securities, total estimated fair value 2,400.0  
Level 2 securities: | 2026 Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Convertible notes 268.0 257.0
Level 2 securities: | 2025 Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Convertible notes 768.6 711.9
Level 2 securities: | 2027 Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Convertible notes 839.1 796.2
Level 2 securities: | 2028 Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Convertible notes $ 1,100.0 $ 1,000.0
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