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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosures Of Commitments And Contingencies [Abstract] |
Disclosure of operating lease commitments |
|  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
|  | $M |  | $M |  | $M |
| Operating lease commitments—Group as a lessee |  |  |  |  |  |
| Minimum lease payments under operating leases recognized in the consolidated income statement | 5.1 |  |  | 4.8 |  |  | 5.6 |  |
Disclosure of maturity analysis of operating lease payments | At the balance sheet date, the Group had outstanding commitments for future minimum lease payments under non-cancellable operating leases, which fall due as follows:
|  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
|  | $M |  | $M |  | $M |
| Within one year | 5.4 |  |  | 4.6 |  |  | 4.9 |  |
| In two to five years | 14.5 |  |  | 11.8 |  |  | 13.5 |  |
| In over five years | 14.5 |  |  | 10.7 |  |  | 12.4 |  |
|  | 34.4 |  |  | 27.1 |  |  | 30.8 |  |

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- Definition The disclosure of finance leases and operating leases by the lessee. + 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 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The disclosure of a maturity analysis of operating lease payments. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2017-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_97&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosures Of Commitments And Contingencies [Abstract] + References No definition available. + Details
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