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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Millions
Total
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Net Unrealized Appreciation (Depreciation) on Investments [Member]
Net Unrealized Appreciation (Depreciation) on Investments [Member]
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Defined Benefit Pension and Postretirement Plans [Member]
Defined Benefit Pension and Postretirement Plans [Member]
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Long Duration Insurance Contracts [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss), net of tax [Member]
Balance at beginning year at Dec. 31, 2022     $ 0.0 $ 0.6 $ 1,913.1 $ (641.4)   $ (64.1)   $ 4.0 $ 2,992.9 $ 0.0 $ 2,992.9 $ (1,871.4)  
Net Income (Loss) $ 35.3 $ (19.5)         $ (14.6)       35.3        
Shares purchased at cost                           0.0  
Employee and director stock-based awards and other         26.1                    
Net appreciation on available-for-sale securities 178.6         178.6                  
Net actuarial gains (losses) arising in the period 3.1             3.1              
Net amount recognized as net periodic benefit cost 33.5               $ 6.2            
Net change in market risk (3.6)                 (3.6)          
Dividends to shareholders                     (118.8)        
Net shares reissued at cost under employee stock-based compensation plans                           5.0  
Balance at end of year at Dec. 31, 2023 2,465.6   0.0 0.6 1,939.2 (462.8)   (54.8)   0.4 2,909.4 0.0 2,909.4 (1,866.4) $ (517.2)
Net Income (Loss) 426.0 (74.8)         (69.9)       426.0        
Shares purchased at cost                           (26.7)  
Employee and director stock-based awards and other         34.4                    
Net appreciation on available-for-sale securities 59.3         59.3                  
Net actuarial gains (losses) arising in the period (5.8)             (5.8)              
Net amount recognized as net periodic benefit cost 425.3               5.4            
Net change in market risk 2.0                 2.0          
Dividends to shareholders                     (125.8)        
Net shares reissued at cost under employee stock-based compensation plans                           7.4  
Balance at end of year at Dec. 31, 2024 2,841.8   0.0 0.6 1,973.6 (403.5)   (55.2)   2.4 3,209.6 $ 1.9 $ 3,211.5 (1,885.7) (456.3)
Net Income (Loss) 662.5 $ (52.7)         $ (48.5)       662.5        
Shares purchased at cost                           (130.1)  
Employee and director stock-based awards and other         39.9                    
Net appreciation on available-for-sale securities 287.2         287.2                  
Net actuarial gains (losses) arising in the period (4.4)             (4.4)              
Net amount recognized as net periodic benefit cost 660.7               $ 5.3            
Net change in market risk (3.2)                 (3.2)          
Dividends to shareholders                     (132.4)        
Net shares reissued at cost under employee stock-based compensation plans                           3.0  
Balance at end of year at Dec. 31, 2025 $ 3,571.5   $ 0.0 $ 0.6 $ 2,013.5 $ (116.3)   $ (54.3)   $ (0.8) $ 3,741.6     $ (2,012.8) $ (171.4)