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Subsequent events - Vessel sales (Details) - Sale of Vessels
$ in Millions
1 Months Ended
Mar. 31, 2026
USD ($)
vessel
Feb. 28, 2026
USD ($)
Jan. 31, 2026
USD ($)
2023 $1.0 Billion Credit Facility      
Disclosure of non-adjusting events after reporting period [line items]      
Repayments of non-current borrowings $ 20.2    
2023 $1.0 Billion Credit Facility, Revolver      
Disclosure of non-adjusting events after reporting period [line items]      
Reduction in amount available under revolving portion of facility $ 10.8    
Vessels | STI Seneca and STI Osceola | MR      
Disclosure of non-adjusting events after reporting period [line items]      
Number of vessels in agreement to sell | vessel 2    
Proceeds from sale of vessels $ 35.0    
Vessels | STI Solidarity | LR2      
Disclosure of non-adjusting events after reporting period [line items]      
Proceeds from sale of vessels $ 60.0    
Vessels | STI Lavender | LR2      
Disclosure of non-adjusting events after reporting period [line items]      
Proceeds from sale of vessels     $ 61.2
Vessels | STI Goal and STI Gallantry | LR2      
Disclosure of non-adjusting events after reporting period [line items]      
Proceeds from sale of vessels   $ 52.3  
Vessels | STI Seneca, STI Osceola and STI Solidarity | 2023 $1.0 Billion Credit Facility      
Disclosure of non-adjusting events after reporting period [line items]      
Number of vessels, released from collateral | vessel 3