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Related party transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) item | Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($)
Anglo Ardmore Ship Management Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of ownership interest (as a percent) | 50.00% |  |
Total management fees paid |  | $ 3.2 | $ 2.7
Corporate Joint Venture [Member] | Anglo Ardmore Ship Management Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of ownership interest (as a percent) | 50.00% |  |
Anglo Ardmore Ship Management Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Number of vessels for which technical management services is provided | item | 22 | 22 |
Total management fees paid | $ 3.7 |  |
Related Party [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amounts payable to related party | 0.4 | $ 0.0 |
Amounts Due from (to) related party, Management Fees | 0.0 | 0.0 |
Advances made | 2.6 | 5.2 |
Related Party [Member] | Accounts Payable [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amounts payable to related party | 0.2 | 0.0 |
Related Party [Member] | Accrued Expenses and Other Liabilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amounts payable to related party | $ 0.2 | $ 0.0 |

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