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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Pretax change before reclassifications | $ (85.2) | $ 144.6
Reclassifications out of AOCI | 4.0 | 5.0
Tax effect | 16.5 | (36.6)
Total other comprehensive income, net of tax | (64.7) | 113.0
Unrealized Gains (Losses) on Debt Securities |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Pretax change before reclassifications | (70.3) | 142.0
Reclassifications out of AOCI | 3.4 | 4.5
Tax effect | 16.3 | (36.4)
Total other comprehensive income, net of tax | (50.6) | 110.1
Foreign Currency Translation Adjustment |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Pretax change before reclassifications | (14.9) | 2.6
Reclassifications out of AOCI | 0.0 | 0.0
Tax effect | 0.4 | 0.0
Total other comprehensive income, net of tax | (14.5) | 2.6
Pension Benefit Adjustment |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Pretax change before reclassifications | 0.0 | 0.0
Reclassifications out of AOCI | 0.6 | 0.5
Tax effect | (0.2) | (0.2)
Total other comprehensive income, net of tax | $ 0.4 | $ 0.3

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