Catastrophe Reinsurance - Catastrophe Losses and LAE (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Catastrophe Reinsurance | |||
| Liability for Catastrophe Claims [Line Items] | |||
| Catastrophe Losses and LAE | $ 18.3 | $ 71.3 | $ 87.6 |
| Non-Core Operations | Catastrophe Reinsurance | |||
| Liability for Catastrophe Claims [Line Items] | |||
| Catastrophe Losses and LAE | 5.9 | 48.6 | 52.4 |
| Specialty Property & Casualty Insurance | Operating Segments | |||
| Liability for Catastrophe Claims [Line Items] | |||
| Catastrophe Losses and LAE | 3,077.2 | 2,541.7 | 3,141.9 |
| Specialty Property & Casualty Insurance | Operating Segments | Catastrophe Reinsurance | |||
| Liability for Catastrophe Claims [Line Items] | |||
| Catastrophe Losses and LAE | 11.3 | 20.6 | 32.2 |
| Life Insurance | Operating Segments | Catastrophe Reinsurance | |||
| Liability for Catastrophe Claims [Line Items] | |||
| Catastrophe Losses and LAE | $ 1.1 | $ 2.1 | $ 3.0 |