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Intangible assets - Components and Movements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Intangible assets    
Beginning balance $ 73.8 $ 66.5
Ending balance 92.9 73.8
Cost    
Intangible assets    
Beginning balance 222.4 210.0
Additions 31.3 18.2
Disposals   (4.5)
Effect of movements in exchange rates (0.8) (1.3)
Ending balance 252.9 222.4
Amortization and impairment losses    
Intangible assets    
Beginning balance 148.6 143.5
Amortization 11.5 9.6
Disposals   (4.5)
Effect of movements in exchange rates 0.1  
Ending balance 160.0 148.6
Goodwill    
Intangible assets    
Beginning balance 6.3 7.6
Ending balance 9.6 6.3
Goodwill | Cost    
Intangible assets    
Beginning balance 6.3 7.6
Additions 4.0  
Effect of movements in exchange rates (0.7) (1.3)
Ending balance 9.6 6.3
Software (mostly development costs)    
Intangible assets    
Beginning balance 66.0 58.2
Ending balance 82.9 66.0
Software (mostly development costs) | Cost    
Intangible assets    
Beginning balance 211.6 194.5
Additions 27.3 17.1
Effect of movements in exchange rates (0.1)  
Ending balance 238.8 211.6
Software (mostly development costs) | Amortization and impairment losses    
Intangible assets    
Beginning balance 145.6 136.3
Amortization 10.4 9.3
Effect of movements in exchange rates (0.1)  
Ending balance 155.9 145.6
Dry docking | Cost    
Intangible assets    
Beginning balance   4.5
Disposals   (4.5)
Dry docking | Amortization and impairment losses    
Intangible assets    
Beginning balance   4.5
Disposals   (4.5)
Other intangible assets    
Intangible assets    
Beginning balance 1.5 0.7
Ending balance 0.4 1.5
Other intangible assets | Cost    
Intangible assets    
Beginning balance 4.5 3.4
Additions   1.1
Ending balance 4.5 4.5
Other intangible assets | Amortization and impairment losses    
Intangible assets    
Beginning balance 3.0 2.7
Amortization 1.1 0.3
Ending balance $ 4.1 $ 3.0