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Financial risk management objectives and policies - Reconciliation of Adjusted EBITDA (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Financial Instruments [Abstract] |  |  |
Operating profit | $ 19.3 | $ 35.8 | $ 37.9
Profit on sale of redundant site (Note 5) | (0.4) | (2.1) | 0.0
Changes to defined benefit pension plans (Note 5) | 0.0 | (0.6) | (18.0)
Restructuring and other expense (Note 5) | 21.6 | 2.2 | 22.4
Loss on disposal of property, plant and equipment | 0.1 | 0.2 | 0.0
Other share based compensation charges | 2.2 | 1.4 | 1.3
Depreciation and amortization | 19.0 | 18.4 | 18.6
Adjusted EBITDA | 61.8 | 55.3 | 62.2
Bank and other loans | 108.8 | 121.0 | 131.6
Less: Cash and cash equivalents | (13.3) | (13.6) | (36.9)
Add: Overdrafts | 4.2 | 0.0 | 0.0
Add: Restricted cash | 0.7 | 0.0 | 0.0
Net debt | $ 100.4 | $ 107.4 | $ 94.7
Net debt: Adjusted EBITDA ratio | 1.6 | 1.9 | 1.5

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