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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of net actuarial loss |  |  |  | $ (1.1) |
Unrealized Gains (Losses) on Debt Securities |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net realized losses on sales of debt securities |  | $ (1.0) | $ (2.8) | (4.4) | $ (7.3)
Tax effect |  | 0.3 | 0.8 | 1.1 | 1.9
Pension Benefit Adjustment |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of net actuarial loss | [1] | (0.5) | (0.6) | (1.1) | (1.1)
Tax effect | [1] | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.4
[1] | Amounts are components of net periodic cost. See Note 11 Employee Benefit Plans for additional details.

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