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Business Segments - Segment Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Earned Premiums $ 1,200.8 $ 1,166.4
Net Investment Income 103.1 85.6
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (15.4) 0.0
Other Income 1.5 90.3
Total Revenues 1,352.0 1,229.0
Income (Loss) from Change in Fair Value of Equity and Convertible Securities 52.2 (117.8)
Impairment Losses (4.0) (12.0)
Operating Segments    
Segment Reporting Information [Line Items]    
Total Revenues 1,288.4 1,256.9
Operating Segments | Specialty Property & Casualty Insurance    
Segment Reporting Information [Line Items]    
Earned Premiums 877.6 822.5
Net Investment Income 35.0 28.8
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (7.3)  
Other Income 0.9 0.9
Total Revenues 906.2 852.2
Operating Segments | Preferred Property & Casualty Insurance    
Segment Reporting Information [Line Items]    
Earned Premiums 162.2 180.9
Net Investment Income 15.9 9.7
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (4.1)  
Total Revenues 174.0 190.6
Operating Segments | Life & Health Insurance    
Segment Reporting Information [Line Items]    
Earned Premiums 161.0 163.0
Net Investment Income 51.1 51.0
Variable Interest Entity, Measure of Activity, Income or Loss before Tax (4.0)  
Other Income 0.1 0.1
Total Revenues 208.2 214.1
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Income (Loss) from Change in Fair Value of Equity and Convertible Securities 52.2 (117.8)
Net Realized Gains on Sales of Investments 13.8 16.5
Impairment Losses (4.0) (12.0)
Other $ 1.6 $ 85.4