XML 82 R75.htm IDEA: XBRL DOCUMENT v3.25.3
Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Reclassification Adjustments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications $ 79.8     $ 258.9     $ 262.2 $ 161.3
Reclassifications out of AOCI 2.5     327.2     10.3 332.7
Tax effect (22.9)     (146.9)     (62.3) (128.7)
Total other comprehensive income (loss), net of tax 59.4 $ 54.2 $ 96.6 439.2 $ (9.2) $ (64.7) 210.2 365.3
Unrealized Gains (Losses) on Debt Securities                
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications 91.7     244.0     234.5 165.3
Reclassifications out of AOCI 2.0     326.6     8.9 331.0
Tax effect (22.9)     (146.4)     (61.3) (128.5)
Total other comprehensive income (loss), net of tax 70.8     424.2     182.1 367.8
Foreign Currency Translation Adjustment                
Accumulated Other Comprehensive Income Loss [Line Items]                
Pretax change before reclassifications (11.9)     14.9     27.7 (4.0)
Reclassifications out of AOCI 0.0     0.0     0.0 0.0
Tax effect 0.2     (0.4)     (0.6) 0.2
Total other comprehensive income (loss), net of tax (11.7)     14.5     27.1 (3.8)
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     1.4 1.7
Tax effect (0.2)     (0.1)     (0.4) (0.4)
Total other comprehensive income (loss), net of tax $ 0.3     $ 0.5     $ 1.0 $ 1.3