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v3.25.4

Captive Insurance Operations - Rollforward of Unpaid Losses and LAE (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 USD ($)
Captive Insurance Operations [Abstract] |
Balance at beginning of year | $ 0
Incurred losses and LAE | 19,052
Actual claims paid | (5,980)
Balance at end of year | $ 13,072

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- Definition Actual Claims Paid + References No definition available. + Details
Name: | bwin_ActualClaimsPaid
Namespace Prefix: | bwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Captive Insurance Operations [Abstract] + References No definition available. + Details
Name: | bwin_CaptiveInsuranceOperationsAbstract
Namespace Prefix: | bwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Incurred Losses And Loss Adjusted Expense + References No definition available. + Details
Name: | bwin_IncurredLossesAndLossAdjustedExpense
Namespace Prefix: | bwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Unpaid Losses And Loss Adjustment Reserve + References No definition available. + Details
Name: | bwin_UnpaidLossesAndLossAdjustmentReserve
Namespace Prefix: | bwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant