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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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Balance Type: | credit
Period Type: | duration

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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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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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Period Type: | duration

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

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_
Data Type: | dtr-types:percentItemType
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
Period Type: | duration

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

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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |