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Issued share capital - Summary of Issued Share Capital (Detail) - Ordinary shares [member] - shares shares in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure of classes of share capital [line items] |  |  |
Issued capital, Beginning balance | 1,332.5 | 1,331.9 | 1,331.9
Exercise of share options | 0.1 | 0.4 | 0.6
Issued capital, Ending balance | 1,332.6 | 1,332.3 | 1,332.5

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares issued by the entity, for which full payment has been received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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