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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ 36.4 | $ (71.1) | $ (7.4) |
Reinsurance recoverables | 50.1 | 122.6 |  |
Specialty Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 28.2 | (23.8) | 5.5 |
Commercial Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (12.9) | (12.9) | (6.1) |
Preferred Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 26.7 | (8.2) | 5.8 |
Homeowners |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (2.1) | (19.7) | 3.2 |
Other Personal Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (3.5) | (6.5) | (4.3) |
Property and Liability Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 36.4 | (71.1) | (7.4) |
Reinsurance recoverables | 50.1 | 65.6 | 101.9 | $ 53.1
Catastrophe |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ 0.2 | $ (17.1) | $ (8.4) |

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