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Net Investment Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Net Investment Income [Abstract] |
Schedule of Net Investment Income | The components of net investment income are summarized as follows:
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (in millions) |
Interest on: |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 231.7 |  |  | $ | 206.1 |  |  | $ | 133.0 |
Deposits and other investments |  |  | 303.3 |  |  |  | 135.1 |  |  |  | 47.4 |
Dividends on equity securities |  |  | 10.5 |  |  |  | 9.0 |  |  |  | 10.9 |
Deferred compensation plan assets |  |  | 21.9 |  |  |  | (25.3 | ) |  |  | 18.7 |
Equity in earnings of affiliates, net |  |  | 5.4 |  |  |  | 11.0 |  |  |  | 6.9 |
Other |  |  | 0.2 |  |  |  | 7.2 |  |  |  | 0.8 |
Total investment income |  |  | 573.0 |  |  |  | 343.1 |  |  |  | 217.7 |
Investment expenses |  |  | (3.0 | ) |  |  | (3.0 | ) |  |  | (2.9 | )
Net investment income |  | $ | 570.0 |  |  | $ | 340.1 |  |  | $ | 214.8 |

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