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v3.20.1

Share-based payments - Additional Information (Detail) £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 GBP (£) Employees | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 GBP (£)
Restricted stock plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Unrecognised compensation cost | £ 140.7 | £ 146.0 |
Fair value of shares vested | £ 90.8 | £ 107.2 | £ 114.8
Restricted stock plans [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Unrecognised compensation cost, recognised period | 1 year |  |
Restricted stock plans [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Unrecognised compensation cost, recognised period | 2 years |  |
Executive Performance Share Plan [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Performance period | 5 years |  |
Executive Performance Share Plan [member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Threshold performance vesting percentage | 20.00% |  |
Compound annual growth percentage | 7.00% |  |
Average return on equity percentage | 10.00% |  |
Compound annual growth percentage | 14.00% |  |
Percentage of total Shareholder Return on vesting period | 15.00% |  |
Executive Performance Share Plan [member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Threshold performance vesting percentage | 100.00% |  |
Compound annual growth percentage | 14.00% |  |
Average return on equity percentage | 14.00% |  |
Compound annual growth percentage | 18.00% |  |
Percentage of total Shareholder Return on vesting period | 100.00% |  |
Executive Performance Share Plan [member] | Weighted average [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Average return on equity percentage | 7.50% |  |
Performance Share Awards [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Vesting period | 2 years |  |
Leaders, Partners and High Potential Group [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line items] |  |  |
Vesting period | 3 years |  |
Number of key executives participating in restricted stock plans | Employees | 1,500 |  |

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