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Right of use assets and related lease liabilities - Narrative (Details)
 1 Months Ended 12 Months Ended
Sep. 26, 2019
USD ($)
vessel
Nov. 30, 2023
USD ($)
vessel
Apr. 30, 2022
USD ($)
Apr. 30, 2017
USD ($)
agreement
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2021
USD ($)
vessel
Dec. 31, 2020
vessel
Jan. 31, 2019
agreement
Jan. 01, 2019
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels under fixed rate bareboat charter agreements | vessel         3 3        
Number of vessels under variable rate bareboat charter agreements | vessel         18 19        
Number of vessels | vessel         1          
Number of vessels, purchase option exercised | vessel         18          
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      
Income from subleasing right-of-use assets         136,600,000 246,500,000 $ 91,800,000      
Trafigura transaction                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Monthly installments $ 200,000                  
Prepayments $ 18,000,000                  
Vessels are required to maintain a fair value, as determined by the average value of semi-annual appraisals from two approved third party brokers 111.00%                  
Trafigura transaction | London Interbank Offered Rate LIBOR plus margin                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Adjustment to interest rate basis 3.50%                  
Trafigura transaction | From the latter of the date of the Trafigura Transaction or the delivery date of the respective vessel                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels | vessel 8                  
Modified agreement period 8 years                  
Gross carrying amount                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Additions         33,302,000          
Borrowings         1,617,439,000 1,948,592,000        
IFRS 16 - Leases - 3 MR (See Note 6) | Gross carrying amount                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Borrowings         0 21,138,000        
IFRS 16 - Leases - $670.0 Million (see Note 6)                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Principal repayments recognized in consolidated cash flow statements         459,100,000          
Right-of-use assets, increase (decrease) in revaluation surplus         4,500,000          
Increase (decrease) in liabilities arising from financing activities         4,500,000          
IFRS 16 - Leases - $670.0 Million (see Note 6) | Gross carrying amount                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Borrowings         $ 0 $ 475,939,000        
MR                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16                   6.00%
MR | Trafigura transaction                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Prepayments $ 800,000                  
MR | Bareboat chartered-in product tankers | STI Beryl, STI Le Rocher and STI Larvotto                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels | agreement       3         3  
LR2 | Trafigura transaction                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Prepayments $ 1,500,000                  
Vessels                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels | vessel         111 113        
Vessels | STI Beryl, STI Le Rocher and STI Larvotto                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Sale leaseback transaction, deposit per vessel         $ 4,350,000          
Number of vessels, purchase option exercised | vessel   3                
Accretion gain on lease deposits         600,000 $ 600,000        
Vessels | Leasehold interest | Trafigura transaction                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels 19                  
Vessels | Gross carrying amount                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Additions         $ 33,302,000          
Vessels | IFRS 16 - Leases - 3 MR (See Note 6) | STI Beryl, STI Le Rocher and STI Larvotto                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Increase through new leases, liabilities arising from financing activities   $ 28,800,000                
Additions   28,800,000                
Accretion gain on lease deposits   1,000,000                
Lease payments, daily rate   $ 13,100,000                
Vessels | IFRS 16 - Leases - $670.0 Million (see Note 6) | STI Majestic                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Principal repayments recognized in consolidated cash flow statements     $ 25,600,000              
Vessels | MR                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Number of vessels | vessel             13 13    
Vessels | MR | STI Beryl, STI Le Rocher and STI Larvotto                    
Disclosure of finance lease and operating lease by lessee [line items]                    
Leaseback, daily rate       $ 8,800            
Sale leaseback transaction, deposit per vessel       $ 4,400,000            
Sale and leaseback, term of lease       8 years