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Debt Securities (Sales of Debt Securities) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Realized losses on sales of debt securities | $ 3.5 | $ 7.3 | $ 13.5 | $ 11.5
Realized gains on sales of debt securities | 0.7 | 0.5 | 6.2 | 4.0
Proceeds from sales of debt securities | $ 187.5 | $ 161.2 | $ 903.0 | $ 457.4

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