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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2022
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 March 31, 2022 and December 31, 2021:
 March 31, 2022December 31, 2021
MillionsFair
Value
Carrying
Value
Fair
Value
Carrying
Value
Ark 2007 Subordinated Notes$27.8 $30.0 $27.6 $30.0 
Ark 2021 Subordinated Notes$163.4 $154.8 $162.8 $155.9 
NSM Bank Facility$273.1 $270.0 $275.8 $271.2 
Other NSM debt$.7 $.6 $1.0 $.9 
Kudu Credit Facility$241.8 $218.2 $246.8 $218.2 
Other Operations debt$17.7 $17.3 $17.7 $16.8 
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 and Other Operations debt have been determined based on a discounted cash flow approach and are considered to be Level 3 measurements.