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Equity Securities (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Investments [Line Items]
Realized and unrealized net gains (losses) on equity securities	$ 19.5	$ (29.4)	$ 18.2	$ 20.5
Net unrealized gains (losses) on equity securities	17.6	(32.2)	14.9	19.0
Common Stock | Offerpad Inc [Member]
Schedule Of Investments [Line Items]
Net unrealized gains (losses) on equity securities	$ (1.8)	$ (16.4)	$ (31.7)	$ 10.2

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

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