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Segment information - Customer concentration (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment information
Revenue from Product Services	$ 2,566,394	$ 2,600,944	$ 1,722,820
Product Services
Segment information
Revenue from Product Services	2,566,394	2,600,944	1,722,820
Top customer | Product Services
Segment information
Revenue from Product Services	$ 281,000	$ 347,000	$ 306,000

X

- Definition

The amount of revenue arising from product services.

+ References

No definition available.

+ Details

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Namespace Prefix:	bwlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SegmentsAxis=bwlp_ProductServicesBusinessSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MajorCustomersAxis=bwlp_CustomerOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: