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Captive Insurance Operations - Rollforward of Unpaid Losses and Loss Adjustment Reserve Table (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Balance at beginning of period | $ 13,072 | $ 0
Incurred losses and LAE | 14,072 | 8,780
Actual claims paid | (4,092) | 0
Balance at end of period | $ 23,052 | $ 8,780

X
- 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

X
- 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

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration