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Business Segments - Segment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Incurred Losses and LAE Related to Prior Years     $ 66.2 $ 27.4
Income Tax Expense $ (8.9) $ 18.5 31.6 52.4
Operating Segments        
Segment Reporting Information [Line Items]        
Operating Expenses 1,195.6 1,005.1 3,360.3 2,888.6
Operating Segments | Specialty Property & Casualty Insurance        
Segment Reporting Information [Line Items]        
Total Incurred Losses and LAE 851.1 647.9 2,287.3 1,869.2
Policy Acquisition Costs 137.0 119.6 409.4 349.0
Business Unit Operating Costs 44.2 40.5 122.6 101.4
Corporate Overhead Costs 33.4 34.8 102.5 102.1
Total Insurance Expenses 214.6 194.9 634.5 552.5
Income Tax Expense 0.3 26.2 44.4 69.1
Operating Expenses 1,066.0 869.0 2,966.2 2,490.8
Operating Segments | Specialty Property & Casualty Insurance | Non-catastrophe Losses        
Segment Reporting Information [Line Items]        
Incurred Losses and LAE Related to Current Year 798.7 644.2 2,211.1 1,846.0
Incurred Losses and LAE Related to Prior Years 51.4 (0.1) 65.5 4.4
Operating Segments | Specialty Property & Casualty Insurance | Catastrophe Losses        
Segment Reporting Information [Line Items]        
Incurred Losses and LAE Related to Current Year 1.0 3.6 10.1 18.0
Incurred Losses and LAE Related to Prior Years 0.0 0.2 0.6 0.8
Operating Segments | Life Insurance        
Segment Reporting Information [Line Items]        
Policyholders’ Benefits and Incurred Losses and LAE 60.5 64.1 186.2 191.0
Policy Acquisition Costs 32.8 34.9 97.7 100.3
Business Unit Operating Costs 24.6 24.1 76.1 71.6
Corporate Overhead Costs 8.2 10.0 25.9 31.0
Total Insurance Expenses 65.6 69.0 199.7 202.9
Income Tax Expense 3.5 3.0 8.2 3.9
Operating Expenses $ 129.6 $ 136.1 $ 394.1 $ 397.8