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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount:      
Income tax expense at U.S. federal statutory tax rate $ 177.2 $ 112.9 $ 8.7
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES UNITED STATES UNITED STATES
Adjustments for state income tax, nontaxable, nondeductible and other items, net of federal tax benefits as applicable $ 5.9    
Nondeductible expenses   $ 4.8 $ 3.8
Stock-based compensation windfall benefit   (1.9) (1.1)
Tax difference related to investment disposals and maturities   (1.2) (1.3)
Change in uncertain tax positions   (1.0) (0.9)
Current year federal tax credits   (0.9) (0.7)
Dividend received deduction   (0.3) (0.5)
Other, net   0.1 (0.4)
Total income tax expense $ 183.1 $ 112.5 $ 7.6
Percentages:      
U.S. statutory federal income tax rate 21.00%    
Adjustments for state income tax, nontaxable, nondeductible and other items, net of federal tax benefits as applicable 0.70%    
Effective income tax rate 21.70% 20.90% 18.50%