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Fair Value of Financial Instruments
12 Months Ended
Dec. 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. See Note 7 — “Debt”.
    The following tables presents the fair value and carrying value of these financial instruments as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
MillionsFair ValueCarrying ValueFair ValueCarrying Value
Ark 2007 Subordinated Notes$27.6 $30.0 $— $— 
Ark 2021 Subordinated Notes$162.8 $155.9 $— $— 
NSM Bank Facility$275.8 $271.2 $279.3 $271.3 
Other NSM debt$1.0 $.9 $1.3 $1.3 
Kudu Credit Facility$246.8 $218.2 $— $— 
Kudu Bank Facility$ $ $89.3 $86.3 
Other Operations debt$17.7 $16.8 $18.8 $17.5 

The fair value estimates for the Ark 2007 Subordinated Notes, the Ark 2021 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.