Fair Value of Financial Instruments (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Balance Sheet Grouping, Financial Statement Captions | ||
| Carrying Value | $ 676.1 | $ 562.5 |
| Ark 2021 Subordinated Notes | ||
| Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value | 173.2 | 173.9 |
| Carrying Value | 156.1 | 154.5 |
| HG Global Senior Notes | ||
| Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value | 154.8 | 157.2 |
| Carrying Value | 147.5 | 147.4 |
| Kudu Credit Facility | ||
| Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value | 260.6 | 253.3 |
| Carrying Value | 246.6 | 238.6 |
| Bamboo Credit Facility | ||
| Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value | 103.6 | 0.0 |
| Carrying Value | 104.7 | 0.0 |
| Other Operations debt | ||
| Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value | 22.0 | 23.1 |
| Carrying Value | $ 21.2 | $ 22.0 |