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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
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 this financial instrument as of September 30, 2020 and December 31, 2019:
|  | September 30, 2020 |  | December 31, 2019
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
NSM Bank Facility |  | $ | 276.1 |  |  | $ | 268.8 |  |  | $ | 221.2 |  |  | $ | 217.4 |
Other NSM debt |  | $ | 1.6 |  |  | $ | 1.4 |  |  | $ | 1.7 |  |  | $ | 1.8 |
Kudu Bank Facility |  | $ | 74.4 |  |  | $ | 71.0 |  |  | $ | 53.6 |  | (1) | $ | 53.6 |
Other Operations debt |  | $ | 18.5 |  |  | $ | 18.2 |  |  | $ | 11.3 |  |  | $ | 10.7 |
(1) White Mountains measured the fair value of the Kudu Bank Facility debt at the carrying value as a result of the debt being acquired on December 23, 2019. See Note 5 — “Debt”.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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