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Financial risk management objectives and policies - Maturity Profile of Contractual Undiscounted Payments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities $ 178.4 $ 176.0
Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities 203.0 204.3
Less: future finance charges    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities (24.6) (28.3)
Within 12 months | Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities 84.5 56.4
1-5 years | Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities 63.6 90.5
In over five years | Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Undiscounted contractual maturity of financial liabilities $ 54.9 $ 57.4