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Fair Value Measurements - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Equity Securities, Fair Value $ 193.2
Marketable securities contractual maturities 283.1
Marketable securities, Total Estimated Fair Value 1,500.0
Level 2 Securities | 2027 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes 1,100.0
Level 2 Securities | 2025 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes 650.1
Level 2 Securities | 2026 Notes  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Convertible notes $ 1,900.0
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
Publicly Traded Equity Securities  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Unrealized gains on investments $ 122.1