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Share-based payments - Movement on Ordinary Shares Granted for Significant Restricted Stock Plans (Detail) Unit_pure in Millions | 12 Months Ended
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Dec. 31, 2019 £ / shares
Executive Performance Share Plan [member] |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |
Weighted average fair value, Non-vested beginning balance | £ 13.63
Weighted average fair value, Granted | 9.89
Weighted average fair value, Lapsed | 13.34
Weighted average fair value, Vested | 12.65
Weighted average fair value, Non-vested ending balance | £ 11.98
Number of shares, Non-vested beginning balance | 6.7
Number of shares, Granted | 4.2
Number of shares, Lapsed | (1.3)
Number of shares, Vested | (0.8)
Number of shares, Non-vested ending balance | 8.8
Performance Share Awards [member] |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |
Weighted average fair value, Non-vested beginning balance | £ 14.37
Weighted average fair value, Granted | 9.26
Weighted average fair value, Lapsed | 12.10
Weighted average fair value, Vested | 15.72
Weighted average fair value, Non-vested ending balance | £ 10.81
Number of shares, Non-vested beginning balance | 2.3
Number of shares, Granted | 1.7
Number of shares, Lapsed | (0.4)
Number of shares, Vested | (1.0)
Number of shares, Non-vested ending balance | 2.6
Leaders, Partners and High Potential Group [member] |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |
Weighted average fair value, Non-vested beginning balance | £ 11.54
Weighted average fair value, Granted | 9.09
Weighted average fair value, Lapsed | 10.76
Weighted average fair value, Vested | 15.51
Weighted average fair value, Non-vested ending balance | £ 9.74
Number of shares, Non-vested beginning balance | 9.1
Number of shares, Granted | 4.1
Number of shares, Lapsed | (1.9)
Number of shares, Vested | (2.0)
Number of shares, Non-vested ending balance | 9.3

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of other equity instruments (ie other than share options) expired in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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