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Investments - Summary of Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Net Investment Income [Line Items] |  |
Total investments | $ 174.4 | $ 177.4
Non Marketable Equity Securities |  |
Net Investment Income [Line Items] |  |
Total investments | 124.1 | 124.1
Seed Capital Investments |  |
Net Investment Income [Line Items] |  |
Total investments | 26.4 | 23.1
Marketable Equity Securities |  |
Net Investment Income [Line Items] |  |
Total investments | 19.6 | 21.6
Partnership interests in private equity funds |  |
Net Investment Income [Line Items] |  |
Total investments | $ 4.3 | $ 8.6

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