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Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Shareholders' equity |  |
Dividends declared | $ 43.3 | $ 39.4
Dividend declared per share | $ 0.23 | $ 0.22
Cash dividends paid | $ 35.6 | $ 30.1
Share dividends paid - DRIP | $ 7.7 | $ 9.3

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- Definition The amount of dividends declared. + References No definition available. + Details
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- Definition The value of share dividends issued from dividend reinvestment plan. + References No definition available. + Details
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The cash outflow for dividends paid by the entity, classified as financing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_31&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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