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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications $ (248.3)     $ (440.2)     $ (200.5) $ (1,322.4)
Reclassifications out of AOCI 5.5     51.5     13.9 62.2
Tax effect 57.2     91.3     45.9 304.4
Total other comprehensive (loss) income, net of tax (185.6) $ (68.1) $ 113.0 (297.4) $ (290.2) $ (368.2) (140.7) (955.8)
Unrealized Gains (Losses) on Debt Securities                
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications (233.6)     (403.6)     (199.9) (1,263.0)
Reclassifications out of AOCI 5.1     50.1     12.4 57.7
Tax effect 56.9     90.8     46.3 304.2
Total other comprehensive (loss) income, net of tax (171.6)     (262.7)     (141.2) (901.1)
Foreign Currency Translation Adjustment                
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications (14.7)     (36.6)     (0.6) (59.4)
Reclassifications out of AOCI 0.0     0.0     0.0 0.0
Tax effect 0.3     0.8     0.0 1.4
Total other comprehensive (loss) income, net of tax (14.4)     (35.8)     (0.6) (58.0)
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 [1] 0.4     1.4     1.5 4.5
Tax effect 0.0     (0.3)     (0.4) (1.2)
Total other comprehensive (loss) income, net of tax $ 0.4     $ 1.1     $ 1.1 $ 3.3
[1] Amounts are components of net periodic cost. See Note 12 Employee Benefit Plans for additional details.