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Significant accounting principles (Details) - Segment	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Information [Abstract]
Number of operating segment	1
Bottom of Range [Member]
Investments in Associates [Abstract]
Percentage of voting rights	20.00%
Docking and Survey Expenditure [Abstract]
Term for vessels to be drydocked	30 months
Top of Range [Member]
Investments in Associates [Abstract]
Percentage of voting rights	50.00%
Docking and Survey Expenditure [Abstract]
Term for vessels to be drydocked	60 months
Vessels [Member]
Property, Plant and Equipment [Abstract]
Expected useful life	20 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Abstract]
Expected useful life	5 years
Computer Equipment and Software [Member]
Property, Plant and Equipment [Abstract]
Expected useful life	3 years
Scrubbers [Member]
Property, Plant and Equipment [Abstract]
Expected useful life		3 years

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

The duration, measured as period of time for vessels to be drydocked.

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- Definition

The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2020-01-01
-Paragraph 16
-Subparagraph b
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 21
-Subparagraph a
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The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2020-01-01
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