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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
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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

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