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Catastrophe Reinsurance - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Catastrophe Claims [Line Items]      
Catastrophic events classification by amount $ 25,000,000    
Ceded earned premiums 36,100,000 $ 31,200,000 $ 27,400,000
Incurred losses and LAE related to prior year (favorable) adverse development 106,700,000 36,400,000 (71,100,000)
Catastrophe      
Liability for Catastrophe Claims [Line Items]      
Catastrophe Losses and LAE 102,400,000 106,900,000 60,100,000
Incurred losses and LAE related to prior year (favorable) adverse development (5,400,000) 200,000 (17,100,000)
Catastrophe | Life & Health Insurance      
Liability for Catastrophe Claims [Line Items]      
Catastrophe Losses and LAE 12,900,000 12,900,000 3,900,000
Incurred losses and LAE related to prior year (favorable) adverse development (100,000) 500,000 800,000
Catastrophe | Specialty Property & Casualty Insurance      
Liability for Catastrophe Claims [Line Items]      
Catastrophe Losses and LAE 16,000,000.0 12,500,000 11,600,000
Incurred losses and LAE related to prior year (favorable) adverse development 300,000 200,000 500,000
Catastrophe | Preferred Property & Casualty Insurance      
Liability for Catastrophe Claims [Line Items]      
Catastrophe Losses and LAE 73,500,000 81,500,000 44,600,000
Incurred losses and LAE related to prior year (favorable) adverse development (5,600,000) (500,000) (18,400,000)
Catastrophe Reinsurance      
Liability for Catastrophe Claims [Line Items]      
Ceded earned premiums 30,300,000 26,700,000 20,500,000
Catastrophe Reinsurance | Life & Health Insurance      
Liability for Catastrophe Claims [Line Items]      
Ceded earned premiums 1,300,000 1,200,000 100,000
Catastrophe Reinsurance | Specialty Property & Casualty Insurance      
Liability for Catastrophe Claims [Line Items]      
Ceded earned premiums 7,000,000.0 4,800,000 200,000
Catastrophe Reinsurance | Preferred Property & Casualty Insurance      
Liability for Catastrophe Claims [Line Items]      
Ceded earned premiums $ 22,000,000.0 $ 20,700,000 $ 20,200,000