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Related party transactions (Details)
$ in Millions
12 Months Ended
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