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Financial risk management (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financial risk management
Percentage of fuel oil costs to total operating expenses	30.00%	30.00%
Equity price risk
Financial risk management
Percentage of reasonably possible increase in risk assumption	20.00%	20.00%
Percentage of reasonably possible decrease in risk assumption	(20.00%)	(20.00%)
Increase (decrease) in profit and loss due to reasonably possible increase in designated risk component	$ 0.3	$ 0.6
Increase (decrease) in profit and loss due to reasonably possible decrease in designated risk component	(0.3)	(0.6)
Increase (decrease) in other comprehensive income/loss due to reasonably possible increase in designated risk component	2.3	4.6
Increase (decrease) in other comprehensive income/loss due to reasonably possible decrease in designated risk component	$ (2.3)	$ (4.6)
Commodity price risk
Financial risk management
Percentage of confidence level as input used in measuring daily value at risk	95.00%

X

- Definition

The increase (decrease) in other comprehensive income loss as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in other comprehensive income loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in profit and loss as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The percentage of confidence level as input used in measuring daily value at risk.

+ References

No definition available.

+ Details

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Namespace Prefix:	bwlp_
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Balance Type:	na
Period Type:	instant

X

- Definition

The percentage of fuel oil costs to the total operating expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	bwlp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- Definition

The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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

X

- Definition

The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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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

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X

- Details

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Namespace Prefix:
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X

- Details

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