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Debt Securities (Sales of Debt Securities) (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Realized losses on sales of debt securities	$ 357.3	$ 88.1	$ 141.4
Realized gains on sales of debt securities	22.2	7.2	4.9
Proceeds from sales of debt securities	5,462.9	$ 1,676.9	$ 1,753.3
Investment Portfolio Rebalancing Project
Debt Securities, Available-for-Sale [Line Items]
Realized losses on sales of debt securities	345.4
Proceeds from sales of debt securities	$ 2,800.0

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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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