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Income tax - Movement in deferred tax assets and liabilities during the year (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance $ (118.5) $ 1.1
Recognised in profit or loss (40.5) (119.4)
Recognised in other comprehensive income 9.9 (0.2)
Ending balance (149.1) (118.5)
Vessels, containers, handling equipments and other tangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance (144.7) (144.5)
Recognised in profit or loss (40.9) (0.2)
Ending balance (185.6) (144.7)
Financial liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance   13.4
Recognised in profit or loss 3.1 (13.4)
Recognised in other comprehensive income 10.3  
Ending balance 13.4  
Employee benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 17.6 16.9
Recognised in profit or loss (4.3) 0.4
Recognised in other comprehensive income (0.4) 0.3
Ending balance 12.9 17.6
Accumulated tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 9.0 117.7
Recognised in profit or loss (2.2) (108.7)
Ending balance 6.8 9.0
Other items    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 0.4 (2.4)
Recognised in profit or loss 3.8 2.5
Recognised in other comprehensive income   (0.5)
Ending balance $ 3.4 $ 0.4