Property and Casualty Insurance Reserves - Narrative (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Incurred losses and LAE related to prior year adverse (favorable) development | $ 14.4 | |
| Property, Liability and Casualty Insurance Product Line | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Incurred losses and LAE related to prior year adverse (favorable) development | $ 15.9 | 14.4 |
| Commercial Automobile | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Incurred losses and LAE related to prior year adverse (favorable) development | $ 23.9 | 24.0 |
| Specialty Personal Automobile | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Incurred losses and LAE related to prior year adverse (favorable) development | $ (10.1) | |