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Taxation - Additional Information (Detail) - GBP (£) £ in Millions		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Income Taxes [line items]
Effective tax rate on profit before taxation		22.10%	9.30%	20.60%
Tax rate		19.00%	19.25%	20.00%
Tax Cuts and Jobs Act revalued deferred tax assets and liabilities			£ 234.1
Tax Cuts and Jobs Act deemed repatriation tax charge related to unremitted foreign earnings		£ 7.3	£ (28.1)
Tax Cuts and Jobs Act payable period			8 years
United States [member]
Disclosure Of Income Taxes [line items]
Tax rate			35.00%
United States [member] | Changes in tax rates or tax laws enacted or announced [member]
Disclosure Of Income Taxes [line items]
Tax rate	21.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
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X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

+ References

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- Definition

Line items represent concepts included in income taxes.

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Tax Cuts and Jobs Act 2017 Payable Period

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- Definition

Effect of change in US tax rate on deferred tax balances.

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- Definition

US Transition Tax related to unremitted foreign earnings.

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