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Debt and Derivatives - Schedule of Interest Rate Swap with Notional Value (Parenthetical) (Details) $ in Millions | Dec. 31, 2025 USD ($)
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Debt Disclosure [Abstract] |
Notional amount, to hedge cash flow risk of variability | $ 500

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- Definition Notional amount, to hedge the cash flow risk of variability. + References No definition available. + Details
Name: | btsg_NotionalAmountToHedgeCashFlowRiskOfVariability
Namespace Prefix: | btsg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration