v3.26.1
Business Segments - Segment Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Earned Premiums [1] $ 1,011.6 $ 1,130.8 $ 2,010.9 $ 2,218.7
Net Investment Income 105.4 95.9 212.5 197.1
Other Income 0.5 3.1 3.9 5.7
Total Revenues 1,092.7 1,225.6 2,199.9 2,418.6
Change in Fair Value of Equity and Convertible Securities (1.7) (0.5) (3.0) (0.4)
Life Insurance        
Segment Reporting [Line Items]        
Earned Premiums (0.2) (0.9) 0.7 (0.7)
Operating Segments        
Segment Reporting [Line Items]        
Earned Premiums 999.3 1,111.3 1,985.3 2,173.2
Total Revenues 1,104.0 1,208.6 2,197.0 2,371.4
Operating Segments | Specialty Property & Casualty Insurance        
Segment Reporting [Line Items]        
Earned Premiums 896.6 1,010.8 1,781.8 1,973.0
Net Investment Income 53.7 49.6 109.0 100.1
Other Income 1.3 2.7 4.0 4.0
Total Revenues 951.6 1,063.1 1,894.8 2,077.1
Operating Segments | Life Insurance        
Segment Reporting [Line Items]        
Earned Premiums 102.7 100.5 203.5 200.2
Net Investment Income 49.3 44.7 98.0 93.1
Other Income 0.4 0.3 0.7 1.0
Total Revenues 152.4 145.5 302.2 294.3
Non-Core Operations        
Segment Reporting [Line Items]        
Earned Premiums 12.3 19.5 25.6 45.5
Total Revenues 14.4 21.3 29.8 49.2
Change in Fair Value of Equity and Convertible Securities (1.7) (0.5) (3.0) (0.4)
Net Realized Investment Gains, Impairment Losses, and Other $ (24.0) $ (3.8) $ (23.9) $ (1.6)
[1]
1 Includes a remeasurement loss of $0.2 million and $0.9 million related to the deferred profit liability within the Life Insurance business for the three months ended June 30, 2026 and 2025, respectively, and a remeasurement gain of $0.7 million for the six months ended June 30, 2026 and a remeasurement loss of $0.7 million for the six months ended June 30, 2025.