Income Taxes (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Income Tax Contingency [Line Items] | |||||
| Net deferred tax benefit | $ (68.0) | ||||
| Effective tax rate | (3.10%) | 13.30% | |||
| Bermuda | |||||
| Income Tax Contingency [Line Items] | |||||
| Deferred tax liabilities | $ 5.1 | ||||
| Deferred tax expense (benefit) | (5.1) | ||||
| LUXEMBOURG | |||||
| Income Tax Contingency [Line Items] | |||||
| Deferred tax expense (benefit) | $ (78.1) | ||||
| P&C Insurance and Reinsurance (Ark/WM Outrigger) | Ark | |||||
| Income Tax Contingency [Line Items] | |||||
| Net deferred tax benefit | (51.0) | ||||
| Financial Guarantee (HG Global) | HG Global | |||||
| Income Tax Contingency [Line Items] | |||||
| Net deferred tax benefit | $ (17.0) | ||||
| Deferred tax liabilities | $ 5.0 | ||||
| Deferred tax expense (benefit) | $ (5.0) | ||||