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Investments - Summary of Investments (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total investments $ 184.6 $ 184.7
Non Marketable Equity Securities    
Schedule of Investments [Line Items]    
Total investments 124.0 124.0
Seed Capital Investments    
Schedule of Investments [Line Items]    
Total investments 27.7 26.1
Marketable Equity Securities    
Schedule of Investments [Line Items]    
Total investments 21.5 23.1
Partnership Interests in Private Equity Funds    
Schedule of Investments [Line Items]    
Total investments $ 11.4 $ 11.5