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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | $ 258.9 |  |  | $ (248.3) |  |  | $ 161.3 | $ (200.5)
Reclassifications out of AOCI | 327.2 |  |  | 5.5 |  |  | 332.7 | 13.9
Tax effect | (146.9) |  |  | 57.2 |  |  | (128.7) | 45.9
Total other comprehensive income (loss), net of tax | 439.2 | $ (9.2) | $ (64.7) | (185.6) | $ (68.1) | $ 113.0 | 365.3 | (140.7)
Unrealized Gains (Losses) on Debt Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | 244.0 |  |  | (233.6) |  |  | 165.3 | (199.9)
Reclassifications out of AOCI | 326.6 |  |  | 5.1 |  |  | 331.0 | 12.4
Tax effect | (146.4) |  |  | 56.9 |  |  | (128.5) | 46.3
Total other comprehensive income (loss), net of tax | 424.2 |  |  | (171.6) |  |  | 367.8 | (141.2)
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | 14.9 |  |  | (14.7) |  |  | (4.0) | (0.6)
Reclassifications out of AOCI | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Tax effect | (0.4) |  |  | 0.3 |  |  | 0.2 | 0.0
Total other comprehensive income (loss), net of tax | 14.5 |  |  | (14.4) |  |  | (3.8) | (0.6)
Pension Benefit Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Reclassifications out of AOCI | 0.6 |  |  | 0.4 |  |  | 1.7 | 1.5
Tax effect | (0.1) |  |  | 0.0 |  |  | (0.4) | (0.4)
Total other comprehensive income (loss), net of tax | $ 0.5 |  |  | $ 0.4 |  |  | $ 1.3 | $ 1.1

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