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Provision for post-employment benefits - Pension Costs (Detail) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Pension Costs [abstract]
Defined contribution plans	£ 172.3	£ 175.9	£ 153.5
Defined benefit plans charge to operating profit	18.9	16.1	24.6
Pension costs (note 5)	191.2	192.0	178.1
Net interest expense on pension plans (note 6)	4.4	6.3	6.7
Pension costs, Net	£ 195.6	£ 198.3	£ 184.8

X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
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X

- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Disclosure Of Pension Costs [abstract]

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No definition available.

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X

- Definition

Postemployment benefit expense defined contribution and benefit plans.

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No definition available.

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- Definition

Post-employment benefit expense defined contribution and benefit plans, including interest.

+ References

No definition available.

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