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Current and long-term debt - 2021 TSFL lease financing (Details)
 1 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Oct. 31, 2023
USD ($)
Jul. 31, 2023
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 30, 2021
USD ($)
vessel
Disclosure of detailed information about borrowings [line items]              
Borrowings   $ 1,588,290,000       $ 1,436,224,000  
Purchase option fees     $ 1,700,000   $ 1,200,000    
Gross carrying amount              
Disclosure of detailed information about borrowings [line items]              
Borrowings   1,617,439,000       1,948,592,000  
2021 TSFL Lease Financing              
Disclosure of detailed information about borrowings [line items]              
Borrowings   46,500,000       50,000,000  
Borrowings, bareboat charter term 7 years            
Net debt to capitalization ratio 0.65            
Consolidated tangible net worth $ 1,000,000,000            
Minimum ratio for fair value of vessels 115.00%            
Purchase option fees   $ 900,000       $ 900,000  
2021 TSFL Lease Financing | Secured Overnight Financing Rate (SOFR)              
Disclosure of detailed information about borrowings [line items]              
Adjustment to interest rate basis       3.20%      
STI Black Hawk, STI Notting Hill and STI Pontiac | 2021 TSFL Lease Financing | Vessels | MR              
Disclosure of detailed information about borrowings [line items]              
Number of vessels under finance lease arrangements | vessel             3
Borrowings             $ 57,700,000