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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ (71.1) | $ (7.4) | $ 18.9 |
Reinsurance recoverables | 122.6 | 158.3 |  |
Specialty Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 23.8 | 5.5 | (2.9) |
Commercial Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (12.9) | (6.1) | (0.6) |
Preferred Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (8.2) | (5.8) | (19.3) |
Homeowners |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (19.7) | 3.2 | (1.0) |
Other Personal Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (6.5) | (4.3) | 3.7 |
Property and Liability Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (71.1) | (7.4) | 18.9 |
Reinsurance recoverables | 65.6 | 101.9 | 53.1 | $ 50.2
Catastrophe |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ (17.1) | $ (8.4) | (4.5) |
Catastrophe | Homeowners |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development |  |  | $ (3.7) |

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