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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Net Unrealized Appreciation (Depreciation) on Investments [Member]
Defined Benefit Pension and Postretirement Plans [Member]
Long Duration Insurance Contracts [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2022   $ 0.6 $ 1,913.1 $ (641.4) $ (64.1) $ 4.0 $ 2,992.9   $ (1,871.4)
Net income (loss) $ (72.6)           (72.6)    
Employee and director stock-based awards and other     18.3            
Net appreciation (depreciation) on available-for-sale securities (86.1)     (86.1)          
Net amount recognized as net periodic benefit cost         4.7        
Net change in market risk           2.6      
Dividends to shareholders             (88.0)    
Net shares reissued at cost under employee stock-based compensation plans                 3.7
Balance at end of period at Sep. 30, 2023 2,116.3   1,931.4 (727.5) (59.4) 6.6 2,832.3 $ (780.3) (1,867.7)
Balance at beginning of period at Jun. 30, 2023   0.6 1,923.0 (613.3) (60.9) 3.3 2,853.0   (1,867.8)
Net income (loss) 8.6           8.6    
Employee and director stock-based awards and other     8.4            
Net appreciation (depreciation) on available-for-sale securities (114.2)     (114.2)          
Net amount recognized as net periodic benefit cost         1.5        
Net change in market risk           3.3      
Dividends to shareholders             (29.3)    
Net shares reissued at cost under employee stock-based compensation plans                 0.1
Balance at end of period at Sep. 30, 2023 2,116.3   1,931.4 (727.5) (59.4) 6.6 2,832.3 (780.3) (1,867.7)
Balance at beginning of period at Dec. 31, 2023 2,465.6 0.6 1,939.2 (462.8) (54.8) 0.4 2,909.4   (1,866.4)
Balance at beginning of period at Dec. 31, 2023 (1,866.4)                
Net income (loss) 258.1           258.1    
Employee and director stock-based awards and other     23.7            
Net appreciation (depreciation) on available-for-sale securities 214.9     214.9          
Net amount recognized as net periodic benefit cost         4.1        
Net change in market risk           (1.3)      
Dividends to shareholders             (93.0)    
Net shares reissued at cost under employee stock-based compensation plans                 5.6
Balance at end of period at Sep. 30, 2024 2,877.7   1,962.9 (247.9) (50.7) (0.9) 3,074.5 (299.5) (1,860.8)
Balance at end of period at Sep. 30, 2024 (1,860.8)                
Balance at beginning of period at Jun. 30, 2024   $ 0.6 1,951.9 (490.9) (52.1) 2.2 3,003.4   (1,862.9)
Net income (loss) 102.1           102.1    
Employee and director stock-based awards and other     11.0            
Net appreciation (depreciation) on available-for-sale securities 243.0     243.0          
Net amount recognized as net periodic benefit cost         1.4        
Net change in market risk           (3.1)      
Dividends to shareholders             (31.0)    
Net shares reissued at cost under employee stock-based compensation plans                 2.1
Balance at end of period at Sep. 30, 2024 2,877.7   $ 1,962.9 $ (247.9) $ (50.7) $ (0.9) $ 3,074.5 $ (299.5) $ (1,860.8)
Balance at end of period at Sep. 30, 2024 $ (1,860.8)