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Trade and other receivables - Ageing of Trade Receivables and Other Financial Assets (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [Line items]    
Financial assets £ 10,719.7 £ 11,484.2
Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 7,055.0 £ 7,403.9
Expected credit loss rate 0.60% 1.00%
Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 7,098.9 £ 7,475.4
Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (43.9) (71.5)
Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 3,150.6 £ 3,468.3
Expected credit loss rate 0.50% 0.50%
Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 3,165.6 £ 3,485.6
Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (15.0) (17.3)
Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 514.1 612.0
0-30 days    
Disclosure of financial assets [Line items]    
Financial assets 1,193.2 1,335.4
0-30 days | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 611.6 £ 700.6
Expected credit loss rate 0.20% 0.80%
0-30 days | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 612.7 £ 706.4
0-30 days | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (1.1) (5.8)
0-30 days | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 547.8 £ 603.6
Expected credit loss rate 0.10% 0.00%
0-30 days | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 548.3 £ 603.8
0-30 days | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (0.5) (0.2)
0-30 days | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 33.8 31.2
31-90 days    
Disclosure of financial assets [Line items]    
Financial assets 531.9 697.0
31-90 days | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 182.1 £ 240.5
Expected credit loss rate 0.50% 2.70%
31-90 days | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 183.0 £ 247.1
31-90 days | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (0.9) (6.6)
31-90 days | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 335.4 £ 450.4
Expected credit loss rate 0.40% 0.00%
31-90 days | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 336.7 £ 450.5
31-90 days | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (1.3) (0.1)
31-90 days | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 14.4 6.1
91-180 days    
Disclosure of financial assets [Line items]    
Financial assets 288.2 421.1
91-180 days | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 50.1 £ 60.2
Expected credit loss rate 4.90% 9.90%
91-180 days | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 52.7 £ 66.8
91-180 days | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (2.6) (6.6)
91-180 days | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 231.7 £ 359.9
Expected credit loss rate 5.20% 4.50%
91-180 days | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 244.5 £ 376.8
91-180 days | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (12.8) (16.9)
91-180 days | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 6.4 1.0
181 days- 1 year    
Disclosure of financial assets [Line items]    
Financial assets 51.4 43.9
181 days- 1 year | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 20.3 £ 10.2
Expected credit loss rate 33.70% 56.60%
181 days- 1 year | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 30.6 £ 23.5
181 days- 1 year | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (10.3) (13.3)
181 days- 1 year | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 13.9 £ 27.5
Expected credit loss rate 0.70% 0.00%
181 days- 1 year | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 14.0 £ 27.5
181 days- 1 year | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (0.1) 0.0
181 days- 1 year | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 17.2 6.2
Greater than 1 year    
Disclosure of financial assets [Line items]    
Financial assets 48.4 36.2
Greater than 1 year | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 19.3 £ 7.5
Expected credit loss rate 58.80% 83.40%
Greater than 1 year | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 46.9 £ 45.1
Greater than 1 year | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (27.6) (37.6)
Greater than 1 year | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets 0.0 0.0
Greater than 1 year | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets 0.0 0.0
Greater than 1 year | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets 0.0 0.0
Greater than 1 year | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets 29.1 28.7
Not past due    
Disclosure of financial assets [Line items]    
Financial assets 8,606.6 8,950.6
Not past due | Trade receivables    
Disclosure of financial assets [Line items]    
Financial assets £ 6,171.6 £ 6,384.9
Expected credit loss rate 0.00% 0.00%
Not past due | Trade receivables | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 6,173.0 £ 6,386.5
Not past due | Trade receivables | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (1.4) (1.6)
Not past due | Accrued income    
Disclosure of financial assets [Line items]    
Financial assets £ 2,021.8 £ 2,026.9
Expected credit loss rate 0.00% 0.00%
Not past due | Accrued income | Cost    
Disclosure of financial assets [Line items]    
Financial assets £ 2,022.1 £ 2,027.0
Not past due | Accrued income | Accumulated impairment losses and write-downs    
Disclosure of financial assets [Line items]    
Financial assets (0.3) (0.1)
Not past due | Other financial assets    
Disclosure of financial assets [Line items]    
Financial assets £ 413.2 £ 538.8