Reserves for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior year claims and claims adjustment expense | $ 4.7 | $ (16.0) | $ (31.1) | $ 32.4 |
| Insurance | ||||
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior year claims and claims adjustment expense | 10.3 | 103.2 | ||
| Reinsurance | ||||
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior year claims and claims adjustment expense | $ (41.4) | $ (70.8) | ||