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SCHEDULE V - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE V - VALUATION AND QUALIFYING ACCOUNTS
WHITE MOUNTAINS INSURANCE GROUP, LTD.
VALUATION AND QUALIFYING ACCOUNTS

Column AColumn BColumn CColumn DColumn E
Additions (subtractions)
MillionsBalance at beginning of
period		Charged to costs
and expenses		Charged to other
accounts
Deductions described (1)
Balance at end of
period
Years ended:     
Ark/WM Outrigger
December 31, 2025     
Reinsurance recoverables:     
Allowance for uncollectible balances
$10.2 $1.4 $— $— $11.6 
December 31, 2024
Reinsurance recoverables:
Allowance for uncollectible balances7.7 2.5 — — 10.2 
December 31, 2023
Reinsurance recoverables:
Allowance for uncollectible balances7.8 (.2)— .1 7.7 
(1)Represents net collections (charge-offs) of balances receivable and foreign currency translation.