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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of the fair value and carrying value of financial instruments | The following table presents the fair value and carrying value of these financial instruments as of December 31, 2025 and 2024:
|  | December 31, 2025 |  | December 31, 2024
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Ark 2021 Subordinated Notes |  | $ | 179.2 |  |  | $ | 159.7 |  |  | $ | 173.9 |  |  | $ | 154.5 |
HG Global Senior Notes |  | $ | 153.8 |  |  | $ | 147.8 |  |  | $ | 157.2 |  |  | $ | 147.4 |
Kudu Credit Facility |  | $ | 365.3 |  |  | $ | 350.4 |  |  | $ | 253.3 |  |  | $ | 238.6 |
Distinguished Credit Facility |  | $ | 131.2 |  |  | $ | 129.9 |  |  | $ | — |  |  | $ | — |
Distinguished other debt |  | $ | 12.2 |  |  | $ | 10.9 |  |  | $ | — |  |  | $ | — |
Other Operations debt |  | $ | 38.0 |  |  | $ | 38.3 |  |  | $ | 23.1 |  |  | $ | 22.0 |

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