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Current and long-term debt - 2023 $1.0 billion credit facility (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
vessel
tanker
Nov. 30, 2023
USD ($)
tanker
Sep. 30, 2023
USD ($)
Aug. 31, 2023
USD ($)
Jul. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
vessel
tanker
Mar. 31, 2023
tanker
Dec. 31, 2022
USD ($)
vessel
Disclosure of detailed information about borrowings [line items]                
Number of vessels | vessel 1         1    
Undrawn borrowing facilities $ 288,200,000         $ 288,200,000    
Borrowings 1,588,290,000         1,588,290,000   $ 1,436,224,000
Gross carrying amount                
Disclosure of detailed information about borrowings [line items]                
Drawdowns           1,386,482,000    
Borrowings $ 1,617,439,000         $ 1,617,439,000   $ 1,948,592,000
Top of range                
Disclosure of detailed information about borrowings [line items]                
Adjustment to interest rate basis 0.26161%         0.26161%    
Vessels                
Disclosure of detailed information about borrowings [line items]                
Number of vessels | vessel 111         111   113
2023 $1.0 Billion Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Loan maximum borrowing capacity         $ 1,000,000,000      
Net debt to capitalization ratio         0.65      
Consolidated tangible net worth         $ 1,500,000,000      
Minimum ratio for fair value of vessels         140.00%      
Undrawn commitment fee         0.78%      
2023 $1.0 Billion Credit Facility | Gross carrying amount                
Disclosure of detailed information about borrowings [line items]                
Drawdowns           $ 901,000,000    
Borrowings $ 564,907,000         564,907,000   $ 0
2023 $1.0 Billion Credit Facility | Consolidated Liquidity Requirement - Scenario One                
Disclosure of detailed information about borrowings [line items]                
Covenant liquidity requirement amount         $ 25,000,000      
2023 $1.0 Billion Credit Facility | Consolidated Liquidity Requirement - Scenario Two                
Disclosure of detailed information about borrowings [line items]                
Liquidity requirement, per each owned ship         500,000      
Liquidity requirement, per each chartered-in ship         250,000      
2023 $1.0 Billion Credit Facility | Repayment Period One                
Disclosure of detailed information about borrowings [line items]                
Periodic borrowing payment amount         $ 29,000,000      
2023 $1.0 Billion Credit Facility | Repayment Period Two | Minimum                
Disclosure of detailed information about borrowings [line items]                
Repayment term         3 years      
2023 $1.0 Billion Credit Facility | Repayment Period Two | Maximum                
Disclosure of detailed information about borrowings [line items]                
Repayment term         5 years      
2023 $1.0 Billion Credit Facility | Repayment Period Two | Top of range                
Disclosure of detailed information about borrowings [line items]                
Periodic borrowing payment amount         $ 22,300,000      
2023 $1.0 Billion Credit Facility | Repayment Period Two | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Periodic borrowing payment amount         $ 18,900,000      
2023 $1.0 Billion Credit Facility | Secured Overnight Financing Rate (SOFR)                
Disclosure of detailed information about borrowings [line items]                
Adjustment to interest rate basis         1.95%      
2023 $1.0 Billion Credit Facility | Vessels                
Disclosure of detailed information about borrowings [line items]                
Repayments     $ 288,200,000          
Twenty Twenty Three $1.0 Billion Credit Facility, Term Loan | Gross carrying amount                
Disclosure of detailed information about borrowings [line items]                
Undrawn borrowing facilities 49,500,000         49,500,000    
Twenty Twenty Three $1.0 Billion Credit Facility, Revolver | Gross carrying amount                
Disclosure of detailed information about borrowings [line items]                
Undrawn borrowing facilities 337,700,000         $ 337,700,000    
STI Supreme, STI Spiga, STI Kingsway, STI Sloane, STI Condotti | 2023 $1.0 Billion Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Drawdowns       $ 135,800,000        
Number of vessels | tanker             5  
STI Lotus, STI Lily, STI Gladiator, STI Gratitude, STI Goal, STI Maximus, STI Leblon and STI Bosphorous | 2023 $1.0 Billion Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Drawdowns   $ 202,300,000            
Number of vessels | tanker   8            
STI Donald C Trauscht, STI Esles II, STI Stability, STI Solace and STI Solidarity | 2023 $1.0 Billion Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Drawdowns $ 122,300,000              
Number of vessels | tanker 5         5    
Twenty One Vessels | 2023 $1.0 Billion Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Drawdowns         $ 440,600,000      
Number of vessels | tanker             21