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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022:
|  | December 31, 2023 |  | December 31, 2022
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
HG Global Senior Notes |  | $ | 158.7 |  |  | $ | 146.9 |  |  | $ | 155.7 |  |  | $ | 146.5 |
Ark 2007 Subordinated Notes |  | $ | 30.5 |  |  | $ | 30.0 |  |  | $ | 28.4 |  |  | $ | 30.0 |
Ark 2021 Subordinated Notes |  | $ | 171.8 |  |  | $ | 155.5 |  |  | $ | 163.1 |  |  | $ | 153.7 |
Kudu Credit Facility |  | $ | 225.6 |  |  | $ | 203.8 |  |  | $ | 223.9 |  |  | $ | 208.3 |
Other Operations debt |  | $ | 30.0 |  |  | $ | 28.4 |  |  | $ | 38.2 |  |  | $ | 36.7 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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