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Intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill $ 80.6 $ 87.0  
Provided during the year   1.7 $ 2.2
Impairment 2.0 0.0 3.7
Intangible assets and goodwill 81.7 80.6 87.0
Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 56.9 62.2  
Intangible assets and goodwill 59.6 56.9 62.2
Customer related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 11.4 11.9  
Intangible assets and goodwill 10.5 11.4 11.9
Technology and trading related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 6.1 7.5  
Intangible assets and goodwill 5.6 6.1 7.5
Development costs      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 5.5 3.9  
Intangible assets and goodwill 4.6 5.5 3.9
Development costs | Internally generated      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 5.5    
Intangible assets and goodwill 4.6 5.5  
Software      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 0.7 1.5  
Intangible assets and goodwill 1.4 0.7 1.5
Cost      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 105.5 113.6  
Additions 1.7 2.7  
Disposals (0.5) (0.6)  
Exchange difference 5.5 (10.2)  
Intangible assets and goodwill 112.2 105.5 113.6
Cost | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 75.3 83.4  
Additions 0.0 0.1  
Disposals 0.0 0.0  
Exchange difference 4.1 (8.2)  
Intangible assets and goodwill 79.4 75.3 83.4
Cost | Customer related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 13.5 13.4  
Additions 0.0 0.1  
Disposals (0.1) 0.0  
Exchange difference 0.0 0.0  
Intangible assets and goodwill 13.4 13.5 13.4
Cost | Technology and trading related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 8.0 9.3  
Additions 0.0 0.0  
Disposals 0.0 0.0  
Exchange difference 0.6 (1.3)  
Intangible assets and goodwill 8.6 8.0 9.3
Cost | Development costs      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 6.0 4.0  
Additions 0.9 2.4  
Disposals 0.0 0.0  
Exchange difference 0.5 (0.4)  
Intangible assets and goodwill 7.4 6.0 4.0
Cost | Software      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill 2.7 3.5  
Additions 0.8 0.1  
Disposals (0.4) (0.6)  
Exchange difference 0.3 (0.3)  
Intangible assets and goodwill 3.4 2.7 3.5
Accumulated depreciation, amortisation and impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (24.9) (26.6)  
Provided during the year 2.3 1.7  
Disposals (0.5) (0.3)  
Impairment 2.0    
Exchange difference (1.8) 3.1  
Intangible assets and goodwill (30.5) (24.9) (26.6)
Accumulated depreciation, amortisation and impairment | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (18.4) (21.2)  
Provided during the year 0.0 0.0  
Disposals 0.0 0.0  
Impairment 0.0    
Exchange difference (1.4) 2.8  
Intangible assets and goodwill (19.8) (18.4) (21.2)
Accumulated depreciation, amortisation and impairment | Customer related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (2.1) (1.5)  
Provided during the year 0.9 0.7  
Disposals (0.1) 0.0  
Impairment 0.0    
Exchange difference 0.0 0.1  
Intangible assets and goodwill (2.9) (2.1) (1.5)
Accumulated depreciation, amortisation and impairment | Technology and trading related      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (1.9) (1.8)  
Provided during the year 0.4 0.4  
Disposals 0.0 0.0  
Impairment 0.5    
Exchange difference (0.2) 0.3  
Intangible assets and goodwill (3.0) (1.9) (1.8)
Accumulated depreciation, amortisation and impairment | Development costs      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (0.5) (0.1)  
Provided during the year 0.7 0.3  
Disposals 0.0 0.0  
Impairment 1.5    
Exchange difference (0.1) (0.1)  
Intangible assets and goodwill (2.8) (0.5) (0.1)
Accumulated depreciation, amortisation and impairment | Software      
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]      
Intangible assets and goodwill (2.0) (2.0)  
Provided during the year 0.3 0.3  
Disposals (0.4) (0.3)  
Impairment 0.0    
Exchange difference (0.1) 0.0  
Intangible assets and goodwill $ (2.0) $ (2.0) $ (2.0)