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Captive Insurance Operations - Rollforward of Unpaid Losses and LAE (Details) $ in Thousands	12 Months Ended
	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

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No definition available.

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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]

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No definition available.

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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

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No definition available.

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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

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No definition available.

+ Details

Name:	bwin_UnpaidLossesAndLossAdjustmentReserve
Namespace Prefix:	bwin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant