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Current and long-term debt - BCFL lease financing (MR) (Details)
1 Months Ended 12 Months Ended
Nov. 30, 2023
USD ($)
vessel
Apr. 30, 2020
USD ($)
Sep. 30, 2017
USD ($)
optionToAcquireAdditionalProperty
vessel
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Jan. 31, 2021
USD ($)
vessel
Jul. 31, 2020
USD ($)
vessel
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                        
Borrowings       $ 1,588,290,000 $ 1,436,224,000              
Principal repayments recognized in consolidated cash flow statements       $ 516,127,000 79,502,000 $ 56,729,000            
Number of vessels, purchase option exercised | vessel       18                
Purchase option fees             $ 1,700,000 $ 1,200,000        
Sellers credit on sale leaseback vessels       $ 0 11,430,000              
BCFL Lease Financing (MRs)                        
Disclosure of detailed information about borrowings [line items]                        
Borrowings       $ 21,700,000 $ 53,200,000              
BCFL Lease Financing (MRs) | STI Amber                        
Disclosure of detailed information about borrowings [line items]                        
Principal repayments recognized in consolidated cash flow statements $ 8,200,000                      
BCFL Lease Financing (MRs) | STI Topaz, STI Garnet, STI Onyx, STI Ruby                        
Disclosure of detailed information about borrowings [line items]                        
Number of vessels, purchase option exercised | vessel 4                      
BCFL Lease Financing (MRs) | STI Ruby                        
Disclosure of detailed information about borrowings [line items]                        
Principal repayments recognized in consolidated cash flow statements $ 7,400,000                      
BCFL Lease Financing (MRs) | Bottom of range                        
Disclosure of detailed information about borrowings [line items]                        
Deposit minimum per vessel     $ 5,100,000                  
Minimum ratio for fair value of vessels     100.00%                  
MR | BCFL Lease Financing (MRs)                        
Disclosure of detailed information about borrowings [line items]                        
Finance lease daily rate per vessel   $ 1,910                    
Increase through new leases, liabilities arising from financing activities   $ 1,900,000                    
Borrowings instrument, term   3 years                    
MR | Installation of scrubbers | BCFL Lease Financing (MRs)                        
Disclosure of detailed information about borrowings [line items]                        
Number of vessels under finance lease arrangements | vessel                 3 1    
Borrowings                 $ 5,800,000 $ 1,900,000    
MR | Vessels | Bottom of range | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx                        
Disclosure of detailed information about borrowings [line items]                        
Sales Leaseback Transaction, Option To Purchase, Term     5 years                  
MR | Vessels | Top of range | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx                        
Disclosure of detailed information about borrowings [line items]                        
Sale leaseback, option to purchase period     10 years                  
MR | Vessels | BCFL Lease Financing (MRs) | STI Amber, STI Topaz, STI Ruby, STI Garnet and STI Onyx                        
Disclosure of detailed information about borrowings [line items]                        
Number of vessels under finance lease arrangements | vessel     5                  
Sale leaseback transaction, gross proceeds per vessel     $ 27,500,000                  
Sale leaseback transaction, term     7 years                  
Finance lease daily rate per vessel                       $ 9,025
Number of options in sale leaseback | optionToAcquireAdditionalProperty     3                  
Sale leaseback, option term     1 year                  
Sale leaseback, deposit per vessel                     $ 5,100,000