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Catastrophe Reinsurance - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophic events classification by amount | $ 25,000,000.0 |  |
Ceded earned premiums | 31,200,000 | $ 27,400,000 | $ 31,600,000
Incurred losses and LAE related to prior year (favorable) adverse development | 36,400,000 | (71,100,000) | (7,400,000)
Catastrophe |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 106,900,000 | 60,100,000 | 87,600,000
Incurred losses and LAE related to prior year (favorable) adverse development | 200,000 | (17,100,000) | (8,400,000)
Catastrophe | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 12,900,000 | 3,900,000 | 4,100,000
Incurred losses and LAE related to prior year (favorable) adverse development | 500,000 | 800,000 | 100,000
Catastrophe | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 12,500,000 | 11,600,000 | 4,400,000
Incurred losses and LAE related to prior year (favorable) adverse development | 200,000 | 500,000 | (300,000)
Catastrophe | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 81,500,000 | 44,600,000 | 79,100,000
Incurred losses and LAE related to prior year (favorable) adverse development | (500,000) | (18,400,000) | (8,200,000)
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 26,700,000 | 20,500,000 | 20,500,000
Catastrophe Reinsurance | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 1,200,000 | 100,000 | 100,000
Catastrophe Reinsurance | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 4,800,000 | 200,000 | 2,600,000
Catastrophe Reinsurance | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 20,700,000 | 20,200,000 | 17,800,000
Reinstatement Premium | Catastrophe Reinsurance | Property & Casualty Insurance Subsidiaries |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 0.0 | 0.0 | 400,000
Reinsurance Recoverable FHCF | Catastrophe |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 1,500,000 | 15,500,000 | 31,800,000
Reinsurance Recoverable FHCF | Catastrophe | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 0.0 | $ 1,600,000 | $ 1,600,000

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