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Business Segments - Segment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Prior Years | $ 22.6 |  | $ (14.6)
Policy Acquisition Costs | 641.6 | $ 707.6 | 838.5
Business Unit Operating Costs | 277.4 | 256.1 | 282.4
Corporate Overhead Costs | 194.9 | 200.0 | 207.8
Insurance Expenses | 1,113.9 | 1,163.7 | 1,328.7
Income Tax Expense (Benefit) | 76.0 | (74.8) | (84.4)
Total Expenses | 4,250.1 | 5,291.3 | 5,894.9
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Expenses | 3,911.2 | 4,393.7 | 5,043.9
Operating Segments | Specialty Property & Casualty Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Incurred Losses and LAE | 2,541.7 | 3,141.9 | 3,578.2
Policy Acquisition Costs | 478.7 | 496.4 | 577.8
Business Unit Operating Costs | 145.0 | 107.8 | 81.2
Corporate Overhead Costs | 135.8 | 137.1 | 142.9
Insurance Expenses | 759.5 | 741.3 | 801.9
Income Tax Expense (Benefit) | 94.6 | (19.2) | (49.5)
Total Expenses | 3,395.8 | 3,864.0 | 4,330.6
Operating Segments | Specialty Property & Casualty Insurance | Non-catastrophe Losses |  |  |
Segment Reporting Information [Line Items] |  |  |
Current Year | 2,514.8 | 2,974.5 | 3,569.2
Prior Years | 6.3 | 135.2 | (14.6)
Operating Segments | Specialty Property & Casualty Insurance | Catastrophe Losses |  |  |
Segment Reporting Information [Line Items] |  |  |
Current Year | 19.9 | 34.5 | 23.0
Prior Years | 0.7 | (2.3) | 0.6
Operating Segments | Life Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Policy Acquisition Costs | 133.9 | 140.0 | 165.1
Business Unit Operating Costs | 96.9 | 96.7 | 137.2
Corporate Overhead Costs | 41.3 | 39.1 | 41.0
Policyholders’ Benefits and Incurred Losses and LAE | 234.5 | 243.4 | 360.8
Insurance Expenses | 272.1 | 275.8 | 343.3
Income Tax Expense (Benefit) | 8.8 | 10.5 | 9.2
Total Expenses | $ 515.4 | $ 529.7 | $ 713.3

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