General information and significant accounting policies (Details)	9 Months Ended
Sep. 30, 2025 segment item subsidiary	Jun. 17, 2017
Overview
Number of operating segments \| segment	1
Numbered of owned vessels in operation	25
Number of chartered vessels in operations	2
Average age	10 years 7 months 6 days
Number of wholly owned subsidiaries \| subsidiary	78
Anglo Ardmore Ship Management Limited
Overview
Number of joint ventures	1
Percentage of ownership interest (as a percent)	50.00%
Element 1 Corp.
Overview
Percentage of ownership interest (as a percent)	10.00%	10.00%

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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration