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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Pretax change before reclassifications | $ (12.4) |  | $ (96.8) |  | $ (97.6) | $ 47.8
Reclassifications out of AOCI | 1.5 |  | 3.4 |  | 5.5 | 8.4
Tax effect | 1.7 |  | 25.3 |  | 18.2 | (11.3)
Total other comprehensive income, net of tax | (9.2) | $ (64.7) | (68.1) | $ 113.0 | (73.9) | 44.9
Unrealized Gains (Losses) on Debt Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Pretax change before reclassifications | (8.4) |  | (108.3) |  | (78.7) | 33.7
Reclassifications out of AOCI | 1.0 |  | 2.8 |  | 4.4 | 7.3
Tax effect | 1.6 |  | 25.8 |  | 17.9 | (10.6)
Total other comprehensive income, net of tax | (5.8) |  | (79.7) |  | (56.4) | 30.4
Foreign Currency Translation Adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Pretax change before reclassifications | (4.0) |  | 11.5 |  | (18.9) | 14.1
Reclassifications out of AOCI | 0.0 |  | 0.0 |  | 0.0 | 0.0
Tax effect | 0.2 |  | (0.3) |  | 0.6 | (0.3)
Total other comprehensive income, net of tax | (3.8) |  | 11.2 |  | (18.3) | 13.8
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 | 0.5 |  | 0.6 |  | 1.1 | 1.1
Tax effect | (0.1) |  | (0.2) |  | (0.3) | (0.4)
Total other comprehensive income, net of tax | $ 0.4 |  | $ 0.4 |  | $ 0.8 | $ 0.7

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