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Reserves - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of reserves within equity [line items] |  |  |
Gains (losses) on cash flow hedges, net of tax |  | $ 1.1 | $ (5.4)
Deferred income taxes on items taken to other comprehensive income | $ (5.8) | $ 4.3 | (0.4)
Number of shares purchased | 0 | (634,185) |
Hedging reserve |  |  |
Disclosure of reserves within equity [line items] |  |  |
Increase (decrease) in equity | $ 3.1 | $ 0.2 |
Gains (losses) on cash flow hedges, net of tax | 3.1 | (1.1) | (5.4)
Transfer (gains) losses to consolidated income statement on cash flow hedges | (0.6) | $ 0.9 | 0.1
Deferred income taxes on items taken to other comprehensive income | $ (0.6) |  | $ 1.1
Share based compensation reserve |  |  |
Disclosure of reserves within equity [line items] |  |  |
Number of shares purchased | 0 | 0 |

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_i&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24E_a&doctype=Standard -URIDate 2017-03-09 + Details
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