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Commitments and contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) plaintiff | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Minimum lease payments under operating leases recognized in the consolidated income statement | $ 5.1 | $ 4.8 | $ 5.6
Minimum lease payments payable under non-cancellable operating lease | 34.4 | 27.1 | 30.8
Capital commitments | $ 0.6 | 3.6 | 3.1
Number of plaintiffs | plaintiff | 3 |  |
Leasehold land and buildings | Minimum |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Useful lives of property, plant and equipment, period | 2 years |  |
Leasehold land and buildings | Maximum |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Useful lives of property, plant and equipment, period | 65 years |  |
Plant and equipment held under operating leases | Minimum |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Useful lives of property, plant and equipment, period | 2 years |  |
Plant and equipment held under operating leases | Maximum |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Useful lives of property, plant and equipment, period | 5 years |  |
Within one year |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Minimum lease payments payable under non-cancellable operating lease | $ 5.4 | 4.6 | 4.9
In two to five years |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Minimum lease payments payable under non-cancellable operating lease | 14.5 | 11.8 | 13.5
In over five years |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Minimum lease payments payable under non-cancellable operating lease | $ 14.5 | $ 10.7 | $ 12.4

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- Definition The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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