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Debt Securities (Sales of Debt Securities) (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Debt Securities, Available-for-Sale [Line Items]
Realized losses on sales of debt securities	$ 6.8	$ (1.3)	$ 9.4	$ (5.5)
Realized gains on sales of debt securities	1.4	0.3	2.5	1.1
Proceeds from sales of debt securities	$ 240.2	$ 137.4	$ 507.0	$ 361.9

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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