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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | [1] | $ 4,215.9 | $ 4,529.4 | $ 5,213.4
Net Investment Income |  | 407.5 | 419.7 | 422.6
Other Income |  | 8.2 | 7.2 | 9.2
Total Revenues |  | 4,638.6 | 4,944.2 | 5,523.9
Change in Fair Value of Equity and Convertible Securities |  | (2.7) | 4.7 | (79.9)
Net Realized Investment Gains (Losses) |  | 13.2 | (18.6) | 4.3
Impairment Losses |  | (5.8) | (1.1) | (25.8)
Change in Value of Alternative Energy Partnership Investments |  | 2.3 | 2.9 | (19.9)
Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums |  | (7.2) | (19.1) | 13.3
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums |  | 3,970.3 | 4,020.1 | 4,617.9
Total Revenues |  | 4,337.7 | 4,388.4 | 4,965.3
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums |  | 3,576.4 | 3,632.5 | 4,046.4
Net Investment Income |  | 189.6 | 168.3 | 140.7
Other Income |  | 4.7 | 4.5 | 6.0
Total Revenues |  | 3,772.1 | 3,806.9 | 4,183.2
Change in Value of Alternative Energy Partnership Investments |  | 1.4 | 1.6 | (9.9)
Operating Segments | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums |  | 393.9 | 387.6 | 571.5
Net Investment Income |  | 170.6 | 193.4 | 216.5
Other Income |  | 0.5 | (0.2) | (0.6)
Total Revenues |  | 565.6 | 581.5 | 782.1
Change in Value of Alternative Energy Partnership Investments |  | 0.6 | 0.7 | (5.3)
Non-Core Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums |  | 245.6 | 509.3 | 595.5
Total Revenues |  | 282.4 | 558.4 | 640.5
Change in Fair Value of Equity and Convertible Securities |  | (2.7) | 4.7 | (79.9)
Net Realized Investment Gains (Losses) |  | 13.2 | (18.6) | 4.3
Impairment Losses |  | (5.8) | (1.1) | (25.8)
Other |  | $ 13.8 | $ 12.4 | $ 19.5
[1] | 1 Includes a remeasurement loss related to the deferred profit liability within the Life Insurance business of $7.2 million for the year ended December 31, 2024, a remeasurement loss of $19.1 million for the year ended December 31, 2023, and a remeasurement gain of $13.3 million for the year ended December 31, 2022.

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