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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Summary 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 March 31, 2024 and December 31, 2023:
|  | March 31, 2024 |  | December 31, 2023
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Ark 2007 Subordinated Notes |  | $ | — |  |  | $ | — |  |  | $ | 30.5 |  |  | $ | 30.0 |
Ark 2021 Subordinated Notes |  | $ | 171.8 |  |  | $ | 155.4 |  |  | $ | 171.8 |  |  | $ | 155.5 |
HG Global Senior Notes |  | $ | 158.5 |  |  | $ | 147.0 |  |  | $ | 158.7 |  |  | $ | 146.9 |
Kudu Credit Facility |  | $ | 224.6 |  |  | $ | 203.8 |  |  | $ | 225.6 |  |  | $ | 203.8 |
Other Operations debt |  | $ | 27.4 |  |  | $ | 25.9 |  |  | $ | 30.0 |  |  | $ | 28.4 |

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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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