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Investments - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Total investments	$ 184.6	$ 184.7
Partnership Interests in Private Equity Funds
Schedule of Investments [Line Items]
Total investments	11.4	11.5
Investments, fair value	10.1	9.2
Equity method investments, fair value	1.3	2.3
Seed Capital Investments [Member]
Schedule of Investments [Line Items]
Total investments	$ 27.7	$ 26.1

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Fair value portion of investments accounted under the equity method.

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