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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fixed income securities (amortized costs) $ 12,210.9  
Preferred Stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred Stock, authorized shares (in shares) 75,000,000 75,000,000
Preferred Stock, outstanding shares (in shares) 0 0
Common Stock, par value (in dollars per share) $ 1.00  
Common Stock, authorized shares (in shares) 500,000,000 500,000,000
Common Stock, issued shares (in shares) 248,469,738 248,817,316
Treasury Stock, Common, Shares 0 0
Fixed Income Securities [Member]    
Fixed income securities (amortized costs) $ 12,210.9 $ 12,175.9
Equity Securities [Member]    
Equity securities - cost $ 1,422.8 $ 1,410.7
Common Class B [Member]    
Common Stock, par value (in dollars per share) $ 1.00 $ 1.00
Common Stock, authorized shares (in shares) 100,000,000 100,000,000
Common Stock, issued shares (in shares) 0 0