v3.26.1
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]
Adjustment [Member]
Retained Earnings [Member]
Adjusted Balance [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2024     $ 0.0 $ 0.6 $ 1,973.6 $ (403.5)   $ (55.2)   $ 2.4 $ 3,209.6 $ 1.9 $ 3,211.5   $ (1,885.7)
Net income $ 128.2 $ (15.8)         $ (14.6)       128.2        
Shares purchased at cost                             (11.0)
Employee and director stock-based awards and other         4.7                    
Net appreciation (depreciation) on available-for-sale securities 111.2         111.2                  
Net amount recognized as net periodic benefit cost                 $ 1.4            
Net change in market risk (1.0)                 (1.0)          
Dividends to shareholders                     (32.9)        
Net shares reissued at cost under employee stock-based compensation plans and other                             0.1
Balance at end of period at Mar. 31, 2025 3,044.4       1,978.3 (292.3)   (53.8)   1.4 3,306.8     $ (344.7) (1,896.6)
Balance at beginning of period at Dec. 31, 2025 3,571.5   $ 0.0 $ 0.6 2,013.5 (116.3)   (54.3)   (0.8) 3,741.6 $ 0.0 $ 3,741.6   (2,012.8)
Net income 186.8 $ (6.1)         $ (4.9)       186.8        
Shares purchased at cost                             (87.5)
Employee and director stock-based awards and other         2.5                    
Net appreciation (depreciation) on available-for-sale securities (68.9)         (68.9)                  
Net amount recognized as net periodic benefit cost                 $ 1.4            
Net change in market risk 1.0                 1.0          
Dividends to shareholders                     (33.9)        
Net shares reissued at cost under employee stock-based compensation plans and other                             (2.5)
Balance at end of period at Mar. 31, 2026 $ 3,570.4       $ 2,016.0 $ (185.2)   $ (52.9)   $ 0.2 $ 3,894.5     $ (237.9) $ (2,102.8)