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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | $ 194.3 | $ (1,167.3) | $ (159.3)
Reclassifications out of AOCI |  | 82.9 | 142.5 | (14.7)
Tax effect |  | (64.1) | 248.3 | 42.0
Total other comprehensive income (loss), net of tax |  | 213.1 | (776.5) | (132.0)
Unrealized Gains (Losses) on Debt Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | 181.4 | (1,181.4) | (168.8)
Reclassifications out of AOCI |  | 80.9 | 136.5 | (20.2)
Tax effect |  | (64.3) | 264.0 | 46.5
Total other comprehensive income (loss), net of tax |  | 198.0 | (780.9) | (142.5)
Foreign Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | 17.7 | (43.3) | (1.9)
Reclassifications out of AOCI |  | 0.0 | 0.0 | 0.0
Tax effect |  | (0.5) | 1.1 | 0.0
Total other comprehensive income (loss), net of tax |  | 17.2 | (42.2) | (1.9)
Pension Benefit Adjustment |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Pretax change before reclassifications |  | (4.8) | 57.4 | 11.4
Reclassifications out of AOCI | [1] | 2.0 | 6.0 | 5.5
Tax effect |  | 0.7 | (16.8) | (4.5)
Total other comprehensive income (loss), net of tax |  | $ (2.1) | $ 46.6 | $ 12.4
[1] | Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.

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