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Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ 106.7 | $ 36.4 | $ (71.1) |
Reinsurance recoverables | 41.9 | 50.1 |  |
Premium Receivable, Credit Loss Expense (Reversal) | 50.5 | 45.5 |  |
Premium Receivable, Allowance for Credit Loss, Writeoff | (57.8) | (46.9) |  |
Specialty Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 85.3 | 28.2 | (23.8) |
Commercial Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 12.4 | (12.9) | (12.9) |
Preferred Automobile |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 12.1 | 26.7 | (8.2) |
Homeowners |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | (6.5) | (2.1) | (19.7) |
Other Personal Lines |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 3.4 | (3.5) | (6.5) |
Property and Liability Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | 106.7 | 36.4 | (71.1) |
Reinsurance recoverables | 41.9 | 50.1 | 65.6 | $ 101.9
Catastrophe |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred losses and LAE related to prior year (favorable) adverse development | $ (5.4) | $ 0.2 | $ (17.1) |

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