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Business Segments - Segment Operating Profit (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] |  |  |  |
Operating Income (Loss) | $ 114.1 | $ (20.2) | $ 200.4 | $ (93.0)
Operating Costs and Expenses [Abstract] |  |  |  |
Less: Net Loss attributable to Noncontrolling Interest | (1.3) | 0.0 | (2.7) | 0.0
Change in Fair Value of Equity and Convertible Securities | (1.2) | 2.4 | 2.2 | 4.1
Net Realized Investment Gains (Losses) |  |  | 8.1 | (8.0)
Impairment Losses | (0.1) | (0.9) | (1.6) | 1.2
Debt Extinguishment, Pension Settlement and Other Charges | 2.7 | 0.0 | 2.7 | 0.0
Goodwill Impairment Charge | 0.0 | (49.6) | 0.0 | (49.6)
Income (Loss) before Income Taxes | 93.2 | (115.9) | 181.2 | (219.8)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 126.5 | (4.9) | 227.0 | (64.8)
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 127.9 | (15.0) | 214.4 | (89.7)
Operating Segments | Non-Core Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (17.3) | (3.7) | (11.3) | (15.9)
Operating Segments | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (1.4) | 10.1 | 12.6 | 24.9
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (13.7) | (15.3) | (29.3) | (28.2)
Segment Reconciling Items |  |  |  |
Operating Costs and Expenses [Abstract] |  |  |  |
Change in Fair Value of Equity and Convertible Securities | (1.2) | 2.4 | 2.2 | 4.1
Net Realized Investment Gains (Losses) | 1.5 | (14.4) | 8.1 | (8.0)
Impairment Losses | 0.1 | 0.9 | (1.6) | 1.2
Acquisition and Disposition Related Transaction, Integration, Restructuring and Other Costs | (6.5) | (29.5) | (19.3) | (58.6)
Debt Extinguishment, Pension Settlement and Other Charges | 2.1 | 0.0 | 2.1 | 0.0
Goodwill Impairment Charge | $ 0.0 | $ (45.5) | $ 0.0 | $ (45.5)

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