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Net Investment Income | 12 Months Ended
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Dec. 31, 2024
Net Investment Income [Abstract] |
Net Investment Income | NOTE 13. Net Investment Income: Net investment income includes interest and earnings on the following investments:
|  | Year ended December 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | (in millions) |
Deposits and other investments |  | $ | 282.3 |  |  | $ | 303.5 |  |  | $ | 142.3 |
Debt securities |  |  | 244.6 |  |  |  | 231.7 |  |  |  | 206.1 |
Deferred compensation plan assets |  |  | 19.5 |  |  |  | 21.9 |  |  |  | (25.3 | )
Dividends on equity securities |  |  | 10.4 |  |  |  | 10.5 |  |  |  | 9.0 |
Equity in earnings of affiliates, net |  |  | 7.4 |  |  |  | 5.4 |  |  |  | 11.0 |
|  |  | 564.2 |  |  |  | 573.0 |  |  |  | 343.1 |
Investment expenses |  |  | (3.2 | ) |  |  | (3.0 | ) |  |  | (3.0 | )
Net investment income |  | $ | 561.0 |  |  | $ | 570.0 |  |  | $ | 340.1 |

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