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Net Investment Income (Schedule of Net Investment Income) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | $ 564.2 | $ 573.0 | $ 343.1
Deposits and other investments | 282.3 | 303.5 | 142.3
Deferred compensation plan assets | 19.5 | 21.9 | (25.3)
Equity in earnings of affiliates, net | 7.4 | 5.4 | 11.0
Investment expenses | (3.2) | (3.0) | (3.0)
Net investment income | 561.0 | 570.0 | 340.1
Debt Securities |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | 244.6 | 231.7 | 206.1
Equity Securities |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | $ 10.4 | $ 10.5 | $ 9.0

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