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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