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Catastrophe Reinsurance - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophic events classification by amount | $ 25,000,000.0 |  |
Ceded earned premiums | 27,400,000 | $ 31,600,000 | $ 18,200,000
Incurred losses and LAE related to prior year (favorable) adverse development | (71,100,000) | (7,400,000) | 18,900,000
Catastrophe |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 60,100,000 | 87,600,000 | 180,400,000
Incurred losses and LAE related to prior year (favorable) adverse development | (17,100,000) | (8,400,000) | (4,500,000)
Catastrophe | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 3,900,000 | 4,100,000 | 6,400,000
Incurred losses and LAE related to prior year (favorable) adverse development | 800,000 | 100,000 | 500,000
Catastrophe | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 11,600,000 | 4,400,000 | 5,200,000
Incurred losses and LAE related to prior year (favorable) adverse development | 500,000 | (300,000) | (300,000)
Catastrophe | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 44,600,000 | 79,100,000 | 168,800,000
Incurred losses and LAE related to prior year (favorable) adverse development | (18,400,000) | (8,200,000) | (4,700,000)
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 20,500,000 | 20,500,000 | 11,000,000.0
Catastrophe Reinsurance | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 100,000 | 100,000 | 100,000
Catastrophe Reinsurance | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 200,000 | 2,600,000 | 100,000
Catastrophe Reinsurance | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 20,200,000 | 17,800,000 | 10,800,000
Catastrophe Reinsurance | Catastrophe | Property & Casualty Insurance Subsidiaries |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 15,500,000 | 31,800,000 | 11,900,000
Reinstatement Premium | Catastrophe Reinsurance | Property & Casualty Insurance Subsidiaries |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 0.0 | 400,000 | 800,000
Reinstatement premiums | 900,000 |  |
Reinsurance Recoverable FHCF | Catastrophe | Property & Casualty Insurance Subsidiaries |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 0 | 0 | 0
Reinsurance Recoverable FHCF | Catastrophe | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 1,600,000 | $ 1,600,000 | $ 200,000

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