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Assets held for sale and discontinued operations - Detailed Information About Amounts Of Discontinued Operations Included In Profit (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [LineItems]      
Revenue [1] £ 13,234.1 £ 13,046.7 [2] £ 13,146.4 [2]
Costs of services (10,825.1) (10,559.1) (10,481.6)
Gross profit 2,409.0 2,487.6 2,664.8
General and administrative costs (1,113.1) (1,249.7) (1,086.9)
Operating profit 1,295.9 1,237.9 1,577.9
Share of results of associates 14.7 30.5 [2] 98.0 [2]
Profit before interest and taxation 1,310.6 1,268.4 1,675.9
Finance income 99.0 98.9 89.0
Finance costs (359.1) (279.1) (261.9)
Revaluation Of Financial Instruments (68.4) 169.4 243.9
Profit before taxation 982.1 1,257.6 1,746.9
Attributable tax expense (275.0) (256.0) (83.0)
Profit after taxation 717.9 1,139.4 1,912.3
Goodwill impairment on classification as held for sale [3] (94.5)    
Attributable to:      
Equity holders of the parent 624.1 1,062.9 1,816.6
Non-controlling interests 93.8 76.5 95.7
Profit for the year from discontinued operations 10.8 137.8 248.4
Discontinued operations [member]      
Statement [LineItems]      
Revenue 2,387.5 2,555.7 2,657.8
Costs of services (1,951.5) (2,104.4) (2,147.4)
Gross profit 436.0 451.3 510.4
General and administrative costs (151.7) (257.8) (180.1)
Operating profit 284.3 193.5 330.3
Share of results of associates 6.5 13.0 15.5
Profit before interest and taxation 290.8 206.5 345.8
Finance income 3.6 5.4 6.2
Finance costs (17.3) (9.7) (7.9)
Revaluation Of Financial Instruments (9.4) 3.5 18.3
Profit before taxation 267.7 205.7 362.4
Attributable tax expense (78.8) (67.9) (114.0)
Profit after taxation 188.9 137.8 248.4
Gain on sale of discontinued operations 73.8    
Attributable tax expense on sale of discontinued operations (157.4)    
Net gain attributable to discounted operations 10.8 137.8 248.4
Attributable to:      
Equity holders of the parent (3.8) 126.4 237.1
Non-controlling interests 14.6 11.4 11.3
Profit for the year from discontinued operations £ 10.8 £ 137.8 £ 248.4
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.