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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)