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Strategic Investments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Investment Holdings [Line Items]        
Carrying value of investment in privately-held companies $ 249.8 $ 249.8   $ 169.5
Realized gains on privately held investments   27.8    
Carrying value of investment in publicly traded company 133.8 133.8    
Impairment expense on investment     $ 15.5  
Privately Held Securities        
Investment Holdings [Line Items]        
Unrealized gains on investments 60.6 $ 136.0    
Publicly Traded Equity Securities        
Investment Holdings [Line Items]        
Unrealized gains on investments $ 62.6