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Provision for post-employment benefits - Weighted Average Duration of Defined Benefit Pension Obligations and Distribution of Timing of Benefit Payments (Detail) £ in Millions | 12 Months Ended
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Dec. 31, 2019 GBP (£)
Disclosure of defined benefit plans [line items] |
Weighted average duration of defined benefit obligation | 11 years 2 months 12 days
Within one year [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 51.4
Between one and two years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 45.4
Between two and three years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 46.9
Between three and four years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 44.4
Between four and five years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 42.3
Later than five years and not later than ten years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 216.1
North America [member] |
Disclosure of defined benefit plans [line items] |
Weighted average duration of defined benefit obligation | 9 years 1 month 6 days
North America [member] | Within one year [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 25.1
North America [member] | Between one and two years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 24.5
North America [member] | Between two and three years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 26.0
North America [member] | Between three and four years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 22.3
North America [member] | Between four and five years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 20.9
North America [member] | Later than five years and not later than ten years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 94.7
United Kingdom [member] |
Disclosure of defined benefit plans [line items] |
Weighted average duration of defined benefit obligation | 13 years 9 months 18 days
United Kingdom [member] | Within one year [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 15.8
United Kingdom [member] | Between one and two years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 12.6
United Kingdom [member] | Between two and three years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 12.7
United Kingdom [member] | Between three and four years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 12.9
United Kingdom [member] | Between four and five years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 13.0
United Kingdom [member] | Later than five years and not later than ten years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 67.1
Western Continental Europe [member] |
Disclosure of defined benefit plans [line items] |
Weighted average duration of defined benefit obligation | 12 years 8 months 12 days
Western Continental Europe [member] | Within one year [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 5.8
Western Continental Europe [member] | Between one and two years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 5.5
Western Continental Europe [member] | Between two and three years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 5.8
Western Continental Europe [member] | Between three and four years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 5.7
Western Continental Europe [member] | Between four and five years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 5.6
Western Continental Europe [member] | Later than five years and not later than ten years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 32.6
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] |
Disclosure of defined benefit plans [line items] |
Weighted average duration of defined benefit obligation | 8 years 6 months
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Within one year [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 4.7
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Between one and two years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 2.8
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Between two and three years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 2.4
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Between three and four years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 3.5
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Between four and five years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | 2.8
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] | Later than five years and not later than ten years [member] |
Disclosure of defined benefit plans [line items] |
Expected benefit payments | £ 21.7

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