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Operating profit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Analysis of income and expense [abstract] |  |  |
Research and development expenditure charged to the consolidated income statement | $ 6.9 | $ 5.5 | $ 5.8
Development capital expenditure included within non-current assets (Note 12) | 0.9 | 2.1 | 2.5
Total research and development expenditure | 7.8 | 7.6 | 8.3
Net research and development | 6.9 | 5.5 | 5.8
Depreciation of property, plant and equipment (Note 11) |  | 16.7 | 16.6
Amortization of intangible assets (Note 12) |  | 1.7 | 2.2
Loss on disposal of property, plant and equipment | 0.1 | 0.2 | 0.0
Operating lease expense (Note 26) | 5.1 | 4.8 | 5.6
Restructuring and other expense (Note 5) | 21.6 | 2.2 | 22.4
Net foreign exchange gains | 0.0 | (0.7) | (0.6)
Staff costs (Note 6) | 121.3 | 111.7 | 119.3
Cost of inventories recognized as expense | $ 282.9 | $ 287.3 | $ 316.2

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