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Equity Securities (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule Of Investments [Line Items]
Realized and unrealized net gains on equity securities	$ 38.7	$ 19.5	$ 57.8	$ 18.2
Net unrealized gains on equity securities	$ 35.7	$ 17.6	$ 55.0	$ 14.9

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- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-19

Reference 65: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 19
-Subparagraph (3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-19

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