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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 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 June 30, 2022 and December 31, 2021:
 June 30, 2022December 31, 2021
MillionsFair
Value
Carrying
Value
Fair
Value
Carrying
Value
HG Global Senior Notes$144.8 $146.3 $— $— 
Ark 2007 Subordinated Notes$25.9 $30.0 $27.6 $30.0 
Ark 2021 Subordinated Notes$149.8 $153.5 $162.8 $155.9 
Kudu Credit Facility$264.2 $253.3 $246.8 $218.2 
Other Operations debt$35.4 $35.0 $17.7 $16.8 
The fair value estimates for the HG Global Senior Notes, Ark 2007 Subordinated Notes, Ark 2021 Subordinated Notes, 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.