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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

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