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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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