Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
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

The amount of dividends declared.

No definition available.

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- Definition

The value of share dividends issued from dividend reinvestment plan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

+ Details

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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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