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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | $ 1,033.7 | $ 1,166.9 | $ 2,065.6 | $ 2,347.8
Net Investment Income | 93.0 | 106.3 | 193.4 | 208.1
Change in Value of Alternative Energy Partnership Investments | 0.6 | 0.8 | 1.0 | 1.5
Other Income | 2.4 | 1.7 | 4.2 | 2.9
Total Revenues | 1,129.9 | 1,262.8 | 2,272.9 | 2,557.6
Change in Fair Value of Equity and Convertible Securities | (1.2) | 2.4 | 2.2 | 4.1
Net Impairment Losses Recognized in Earnings | 0.1 | 0.9 | 1.6 | (1.2)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,042.3 | 1,127.5 | 2,066.7 | 2,260.4
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 862.6 | 932.3 | 1,702.6 | 1,876.5
Net Investment Income | 46.6 | 44.5 | 87.7 | 83.0
Change in Value of Alternative Energy Partnership Investments | 0.3 | 0.4 | 0.6 | 0.8
Other Income | 1.3 | 0.7 | 2.4 | 1.6
Total Revenues | 910.8 | 977.9 | 1,793.3 | 1,961.9
Operating Segments | Non-Core Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 70.3 | 132.4 | 164.9 | 269.8
Total Revenues | 83.8 | 145.7 | 190.0 | 293.7
Operating Segments | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 100.8 | 102.2 | 198.1 | 201.5
Net Investment Income | 30.5 | 47.1 | 74.8 | 96.9
Change in Value of Alternative Energy Partnership Investments | 0.1 | 0.2 | 0.2 | 0.4
Other Income | 0.1 | 0.1 | 0.3 | (0.3)
Total Revenues | 131.5 | 149.6 | 273.4 | 298.5
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Change in Fair Value of Equity and Convertible Securities | (1.2) | 2.4 | 2.2 | 4.1
Gain (Loss) on Sale of Investments | 1.5 | (14.4) | 8.1 | (8.0)
Net Impairment Losses Recognized in Earnings | (0.1) | (0.9) | 1.6 | (1.2)
Other | $ 3.6 | $ 2.5 | $ 7.5 | $ 6.2

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