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Dividends paid and proposed (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid during the year |  | $ 3.4 | $ 3.3 | $ 3.3 | $ 3.3 | $ 3.3 | $ 3.3 | $ 3.3 | $ 3.4 | $ 2.7 | $ 2.7 | $ 2.7 | $ 2.7 | $ 13.3 | $ 13.3 | $ 10.8
Dividends declared and paid during the year (USD per share) |  | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid during the year |  |  |  |  | $ 3.4 |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid during the year (USD per share) | $ 0.125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_107&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_107&doctype=Standard -URIDate 2017-03-09 + Details
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