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SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2022
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:     
December 31, 2022     
Reinsurance recoverables:     
Allowance for uncollectible balances
$3.6 $4.6 $— $(0.4)$7.8 
December 31, 2021
Reinsurance recoverables:
Allowance for uncollectible balances2.3 1.3 — — 3.6 
(1)Represents net collections (charge-offs) of balances receivable and foreign currency translation.