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Financial risk management - Capital risk (Details)	Dec. 31, 2025	Dec. 31, 2024
Financial risk management
Target book leverage ratio	60.00%
Leverage ratio net of cash	28.00%	33.00%

X

- Definition

The percentage of leverage ratio net of cash.

+ References

No definition available.

+ Details

Name:	bwlp_LeverageRatioNetOfCash
Namespace Prefix:	bwlp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of target book leverage ratio

+ References

No definition available.

+ Details

Name:	bwlp_TargetBookLeverageRatio
Namespace Prefix:	bwlp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration