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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | $ (104.2) | $ 194.3 | $ (1,167.3)
Reclassifications out of AOCI |  | 337.4 | 82.9 | 142.5
Tax effect |  | (73.8) | (64.1) | 248.3
Total other comprehensive income (loss), net of tax |  | 159.4 | 213.1 | (776.5)
Unrealized Gains (Losses) on Debt Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | (62.4) | 181.4 | (1,181.4)
Reclassifications out of AOCI |  | 335.1 | 80.9 | 136.5
Tax effect |  | (72.8) | (64.3) | 264.0
Total other comprehensive income (loss), net of tax |  | 199.9 | 198.0 | (780.9)
Foreign Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | (47.1) | 17.7 | (43.3)
Reclassifications out of AOCI |  | 0.0 | 0.0 | 0.0
Tax effect |  | 1.0 | (0.5) | 1.1
Total other comprehensive income (loss), net of tax |  | (46.1) | 17.2 | (42.2)
Pension Benefit Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | 5.3 | (4.8) | 57.4
Reclassifications out of AOCI | [1] | 2.3 | 2.0 | 6.0
Tax effect |  | (2.0) | 0.7 | (16.8)
Total other comprehensive income (loss), net of tax |  | $ 5.6 | $ (2.1) | $ 46.6
[1] | Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.

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