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Interest-bearing loans and borrowings - Terms and conditions of outstanding loans (Details) - USD ($)
Dec. 31, 2023
Nov. 07, 2023
Dec. 31, 2022
Dec. 06, 2022
Jun. 21, 2022
Dec. 31, 2021
Dec. 02, 2021
Sep. 11, 2020
Aug. 28, 2019
Dec. 16, 2016
Disclosure of detailed information about borrowings [line items]                    
Notional amount $ 93,607,000   $ 536,532,000              
Borrowings 930,713,000   1,696,280,000     $ 1,712,180,000        
Borrowings Excluding Non-Bank Loans                    
Disclosure of detailed information about borrowings [line items]                    
Facility size 1,353,934,000   2,020,659,000              
Borrowings 540,534,000   1,349,408,000              
Borrowings Excluding Non-Bank Loans | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings 528,359,000   1,333,183,000              
Secured vessels loan due 2029                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 27,100,000                  
Facility size 0   24,650,000              
Borrowings $ 0   24,650,000              
Secured vessels loan due 2029 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.95%                  
Secured vessels loan due 2029 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   24,650,000              
Secured vessels loan due 2029                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 81,400,000                  
Facility size 0   44,098,000              
Borrowings $ 0   44,098,000              
Secured vessels loan due 2029 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.50%                  
Secured vessels loan due 2029 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   42,960,000              
Secured vessels loan due 2030                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 69,400,000                  
Facility size 0   49,751,000              
Borrowings $ 0   49,751,000              
Secured vessels loan due 2030 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.00%                  
Secured vessels loan due 2030 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   49,751,000              
Secured vessels loan due 2030                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 104,200,000                  
Facility size 0   67,251,000              
Borrowings $ 0   67,251,000              
Secured vessels loan due 2030 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.00%                  
Secured vessels loan due 2030 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   66,562,000              
Secured vessels Revolving loan due 2025                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 200,000,000.0                  
Facility size 0   97,376,000              
Borrowings $ 0   90,000,000              
Secured vessels Revolving loan due 2025 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.00%                  
Secured vessels Revolving loan due 2025 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   89,554,000              
Secured vessels Revolving loan due 2026                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 700,000,000.0               $ 700,000,000  
Facility size 0   553,480,000              
Borrowings $ 0   470,000,000              
Secured vessels Revolving loan due 2026 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.95%                  
Secured vessels Revolving loan due 2026 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   466,211,000              
$713.0 million facility                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 713,000,000.0             $ 713,000,000    
Facility size 0   582,876,000              
Borrowings $ 0   350,756,000              
$713.0 million facility | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.30%                  
$713.0 million facility | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   346,866,000              
$73.45 million facility - Cedar and Cypress                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 73,450,000           $ 73,450,000      
Facility size 0   71,155,000              
Borrowings $ 0   71,155,000              
$73.45 million facility - Cedar and Cypress | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.80%                  
$73.45 million facility - Cedar and Cypress | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   70,730,000              
Unsecured Revolving loan due 2026                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 80,000,000                  
Facility size 88,400,000   100,000,000              
Borrowings $ 0   0              
Unsecured Revolving loan due 2026 | LIBOR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.50%                  
Unsecured Revolving loan due 2026 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ (66,000)   (265,000)              
Secured FSO loan due 2030                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 150,000,000       $ 150,000,000          
Margin rate         2.15%          
Facility size 124,809,000   141,747,000              
Borrowings $ 124,809,000   141,747,000              
Secured FSO loan due 2030 | SOFR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.15%                  
Secured FSO loan due 2030 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 123,728,000   140,227,000              
Secured vessels Revolving loan due 2028                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 377,000,000.0     $ 377,000,000           $ 377,000,000
Facility size 0   288,276,000              
Borrowings $ 0   40,000,000              
Secured vessels Revolving loan due 2028 | SOFR                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 1.90%                  
Secured vessels Revolving loan due 2028 | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   35,938,000              
Secured vessels loan Refi - Revolving loan 725.0M*                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 725,000,000.0 $ 725,000,000                
Facility size 725,000,000   0              
Borrowings $ 0   0              
Secured vessels loan Refi - Revolving loan 725.0M* | SOFR | Minimum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.30%                  
Secured vessels loan Refi - Revolving loan 725.0M* | SOFR | Maximum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.90%                  
Secured vessels loan Refi - Revolving loan 725.0M* | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ (8,398,000)   0              
Secured vessels loan Refi - Transition facility 375.0M                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 375,000,000.0 375,000,000                
Facility size 368,225,000   0              
Borrowings $ 368,225,000   0              
Secured vessels loan Refi - Transition facility 375.0M | SOFR | Minimum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.30%                  
Secured vessels loan Refi - Transition facility 375.0M | SOFR | Maximum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.90%                  
Secured vessels loan Refi - Transition facility 375.0M | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 365,662,000   0              
Secured vessels loan Refi - Newbuild facility 190.0M                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount 190,000,000.0 $ 190,000,000                
Facility size 47,500,000   0              
Borrowings $ 47,500,000   0              
Secured vessels loan Refi - Newbuild facility 190.0M | SOFR | Minimum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.30%                  
Secured vessels loan Refi - Newbuild facility 190.0M | SOFR | Maximum                    
Disclosure of detailed information about borrowings [line items]                    
Margin rate 2.90%                  
Secured vessels loan Refi - Newbuild facility 190.0M | Cost                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 47,433,000   $ 0