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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

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