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Income Taxes Reconciliation of Provision (Benefit) for income Taxes Reported in Consolidated Statements Of Income with Tax at Statutory Rate (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income before income taxes $ 4,903.7 $ 922.1 $ 4,210.0
Tax at statutory federal rate 1,029.8 193.6 884.1
Stock-based compensation (21.7) (18.1) (19.4)
Tax credits (16.4) (14.8) (9.9)
Tax-preferenced investment income (10.2) (12.7) (13.2)
State income taxes, net of federal taxes 14.7 (3.1) 16.6
Nondeductible compensation expense 9.8 11.1 8.4
Tax-deductible dividends (4.8) (1.8) (9.4)
Goodwill impairment 0.0 47.2 0.0
Other items, net 0.1 (0.8) 1.9
Provision for income taxes $ 1,001.3 $ 200.6 $ 859.1
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax at statutory federal rate 21.00% 21.00% 21.00%
Stock-based compensation (1.00%) (2.00%) (1.00%)
Tax credits 0.00% (2.00%) 0.00%
Tax-preferenced investment income 0.00% (1.00%) 0.00%
State income taxes, net of federal taxes 0.00% 0.00% 0.00%
Nondeductible compensation expense 0.00% 1.00% 0.00%
Tax-deductible dividends 0.00% 0.00% 0.00%
Goodwill impairment 0.00% 5.00% 0.00%
Other items, net 0.00% 0.00% 0.00%
Total income tax provision 20.00% 22.00% 20.00%