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Catastrophe Reinsurance - Catastrophe Reinsurance Premiums (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | $ 31.2 | $ 27.4 | $ 31.6
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 26.7 | 20.5 | 20.5
Specialty Property & Casualty Insurance | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 4.8 | 0.2 | 2.6
Preferred Property & Casualty Insurance | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 20.7 | 20.2 | 17.8
Life & Health Insurance | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | $ 1.2 | $ 0.1 | $ 0.1

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