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Investments - Summary of Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
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

X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

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