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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investments: |  |
Fixed maturities, available for sale, allowance for credit losses | $ 37.1 | $ 42.9
Fixed maturities, available for sale, amortized cost | 25,264.3 | 23,699.2
Mortgage loans, allowance for credit losses | 13.6 | 15.4
Investments held by variable interest entities, allowance for credit losses | 1.3 | 3.1
Investments held by variable interest entities, amortized cost | 437.0 | 787.6
Reinsurance receivables, allowance for credit losses | $ 3.0 | $ 3.0
Shareholders' equity: |  |
Common stock, par value (in USD per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 8,000,000,000 | 8,000,000,000
Common stock, shares issued (in shares) | 101,618,957 | 109,357,540
Common stock, shares outstanding (in shares) | 101,618,957 | 109,357,540

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