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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.