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Business Segments - Segment Revenues (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]        
Remeasurement gain [1] $ 1,133.3 $ 1,068.5 $ 3,352.0 $ 3,134.1
Net Investment Income 104.8 111.1 301.9 304.5
Other Income 2.9 2.7 8.6 7.9
Total Revenues 1,239.7 1,178.9 3,658.3 3,451.8
Change in Fair Value of Equity and Convertible Securities (2.1) (2.3) (2.5) (0.1)
Impairment Losses 3.1 2.2 6.4 3.8
Life Insurance        
Segment Reporting Information [Line Items]        
Remeasurement gain (0.9) (0.5) (1.6) (1.2)
Operating Segments        
Segment Reporting Information [Line Items]        
Remeasurement gain 1,117.1 1,019.6 3,290.3 2,920.3
Total Revenues 1,221.8 1,123.7 3,593.2 3,190.4
Operating Segments | Specialty Property & Casualty Insurance        
Segment Reporting Information [Line Items]        
Remeasurement gain 1,017.3 919.0 2,990.3 2,621.6
Net Investment Income 53.8 52.0 153.9 139.7
Other Income 2.5 1.6 6.5 4.6
Total Revenues 1,073.6 972.6 3,150.7 2,765.9
Operating Segments | Life Insurance        
Segment Reporting Information [Line Items]        
Remeasurement gain 99.8 100.6 300.0 298.7
Net Investment Income 48.0 50.3 141.1 125.1
Other Income 0.4 0.2 1.4 0.7
Total Revenues 148.2 151.1 442.5 424.5
Non-Core Operations        
Segment Reporting Information [Line Items]        
Remeasurement gain 16.2 48.9 61.7 213.8
Total Revenues 18.2 54.8 67.4 244.8
Change in Fair Value of Equity and Convertible Securities (2.1) (2.3) (2.5) (0.1)
Net Realized Investment Gains 3.9 1.1 4.7 9.2
Impairment Losses (3.1) (2.2) 6.4 3.8
Other $ 1.0 $ 3.8 $ 1.9 $ 11.3
[1]
1 Includes a remeasurement loss related to the deferred profit liability within the Life insurance business of $0.9 million and $0.5 million for the three months ended September 30, 2025 and 2024, respectively, and a remeasurement loss of $1.6 million and $1.2 million for the nine months ended September 30, 2025 and 2024, respectively.