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Financial instruments - Hedging Activities (Details) - Foreign currency translation risk | Dec. 31, 2017 $ / £ € / £ $ / £ | Dec. 31, 2016 $ / £ € / £ $ / £
--- | --- | ---
Sales hedges | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals | 17.1 | 27.6
Sales hedges | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals | € / £ | 27.5 | 39.4
Sales hedges | Australian dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals | 2.8 | 2.9
Exchange rates | 1.7667 | 1.7237
Sales hedges | Minimum | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | 1.2433 | 1.2310
Sales hedges | Minimum | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | € / £ | 1.0949 | 1.0951
Sales hedges | Maximum | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | 1.3444 | 1.5638
Sales hedges | Maximum | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | € / £ | 1.1803 | 1.4200
Purchase hedges | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals | 12.5 | 25.7
Purchase hedges | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals | € / £ | 0.1 | 2.5
Exchange rates | € / £ | 1.1804 |
Purchase hedges | Australian dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Contract totals |  | 1.7
Purchase hedges | Minimum | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | 1.2414 | 1.2311
Purchase hedges | Minimum | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | € / £ |  | 1.1121
Purchase hedges | Maximum | U.S. dollar |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | 1.3389 | 1.5618
Purchase hedges | Maximum | Euros |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Exchange rates | € / £ |  | 1.1804

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_23B_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24A_d&doctype=Standard -URIDate 2017-03-09 + Details
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