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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Equity Securities, Fair Value $ 116.9 $ 116.9 $ 193.2
Gain (loss) on investments 76.2 (79.8)  
Unrealized gains (loss) on investments 53.5 (69.7)  
Marketable securities contractual maturities 0.2 0.2  
Marketable securities 2,400.0 2,400.0  
Level 2 Securities | 2028 Notes      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible notes 1,000.0 1,000.0  
Level 2 Securities | 2027 Notes      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible notes 798.0 798.0 1,100.0
Level 2 Securities | 2025 Notes      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible notes 262.6 262.6 650.1
Level 2 Securities | 2026 Notes      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible notes $ 725.6 $ 725.6 $ 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