Reserves for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior years | $ (32.7) | $ 89.2 | $ (35.8) | $ 48.4 |
| Insurance | ||||
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior years | (5.5) | 105.9 | ||
| Reinsurance | ||||
| Short-Duration Insurance Contracts, Historical Claims Duration [Line Items] | ||||
| Prior years | $ (30.3) | $ (57.5) | ||