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Financial Instruments - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Realized investment gains (losses)       $ 0 $ 8,300,000  
Net unrealized gains/(losses) on investments       16,000,000 29,500,000  
Proceeds from sales of investments       84,900,000 $ 800,700,000 $ 107,300,000
Broncus            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Net unrealized gains/(losses) on investments $ 29,100,000     5,100,000    
Hologic            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Net unrealized gains/(losses) on investments     $ 9,500,000      
Teladoc            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Net unrealized gains/(losses) on investments   $ 11,400,000        
Proceeds from sales of investments   71,500,000        
Gain (loss) on sale of derivatives   $ 7,500,000        
Level 2:            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Changes in fair value       43,800,000    
Level 2: | Broncus            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Equity securities without readily determinable fair value, unrealized gain (loss), portion attributable to investment in preferred shares       $ 34,200,000