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Fair Value of Financial Instruments | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments White Mountains records its financial instruments at fair value with the exception of debt obligations, which are recorded as debt at face value less unamortized original issue discount. The following table presents the fair value and carrying value of this financial instrument as of March 31, 2021 and December 31, 2020:
|  | March 31, 2021 |  | December 31, 2020
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Ark Subordinated Notes (1) |  | $ | 44.1 |  |  | $ | 44.1 |  |  | $ | — |  |  | $ | — |
NSM Bank Facility |  | $ | 275.6 |  |  | $ | 271.5 |  |  | $ | 279.3 |  |  | $ | 271.3 |
Other NSM debt |  | $ | 1.3 |  |  | $ | 1.2 |  |  | $ | 1.3 |  |  | $ | 1.3 |
Kudu Credit Facility (2) |  | $ | 102.0 |  |  | $ | 95.9 |  |  | $ | — |  |  | $ | — |
Kudu Bank Facility |  | $ | — |  |  | $ | — |  |  | $ | 89.3 |  |  | $ | 86.3 |
Other Operations debt |  | $ | 18.3 |  |  | $ | 17.0 |  |  | $ | 18.8 |  |  | $ | 17.5 |
(1) As of March 31, 2021, White Mountains measured the fair value of the Ark Bank Facility Notes at the carrying value as a result of the debt being acquired on January 1, 2021. See Note 7 — “Debt”. (2) As of March 31, 2021, White Mountains measured the fair value of the Kudu Credit Facility debt at the carrying value, before unamortized issuance costs, as a result of the debt being refinanced on March 23, 2021. The fair value estimates for the Ark Subordinated Notes, NSM Bank Facility, the Other NSM debt, the Kudu Credit Facility, the Kudu Bank Facility and Other Operations debt have been determined based on a discounted cash flow approach and are considered to be Level 3 measurements.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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