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Financial risk management objectives and policies - Reconciliation of Net Debt (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Beginning balance $ 107.4 $ 94.7
Cash flows (8.0) 12.4
Reclassification 0.0  
Foreign exchange adjustments (0.3) (0.2)
Restricted cash 0.7  
Other non-cash movements 0.6 0.5
Ending balance 100.4 107.4
Cash at bank and in hand    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Beginning balance (13.6) (36.9)
Cash flows 6.5 21.4
Reclassification (4.2)  
Foreign exchange adjustments (2.0) 1.9
Restricted cash 0.7  
Other non-cash movements 0.0 0.0
Ending balance (12.6) (13.6)
Overdrafts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Beginning balance 0.0 0.0
Cash flows 0.0 0.0
Reclassification 4.2  
Foreign exchange adjustments 0.0 0.0
Restricted cash 0.0  
Other non-cash movements 0.0 0.0
Ending balance 4.2 0.0
Bank and other loans due within one year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Beginning balance 0.0 0.0
Cash flows 0.0 0.0
Reclassification 14.9  
Foreign exchange adjustments 0.0 0.0
Restricted cash 0.0  
Other non-cash movements 0.1 0.0
Ending balance 15.0 0.0
Bank and other loans due after one year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Beginning balance 121.0 131.6
Cash flows (14.5) (9.0)
Reclassification (14.9)  
Foreign exchange adjustments 1.7 (2.1)
Restricted cash 0.0  
Other non-cash movements 0.5 0.5
Ending balance $ 93.8 $ 121.0