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Derivatives and Financial Instruments - Schedule of Derivative Instruments (Details) - Designated as Hedging Instrument
£ in Millions
Dec. 31, 2025
GBP (£)
$ / £
€ / £
$ / £
$ / £
Dec. 31, 2024
GBP (£)
$ / £
$ / £
€ / £
$ / £
U.S. Dollars | Sales hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 29.4 £ 36.5
U.S. Dollars | Sales hedges | Minimum    
Derivative [Line Items]    
Exchange rates 1.3098 1.2511
U.S. Dollars | Sales hedges | Maximum    
Derivative [Line Items]    
Exchange rates 1.3521 1.2999
U.S. Dollars | Purchase hedges    
Derivative [Line Items]    
Contract totals/£m | £   £ 1.2
U.S. Dollars | Purchase hedges | Minimum    
Derivative [Line Items]    
Exchange rates   1.2507
Australian Dollars | Sales hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 1.2  
Australian Dollars | Sales hedges | Minimum    
Derivative [Line Items]    
Exchange rates | € / £ 2.0028  
Australian Dollars | Sales hedges | Maximum    
Derivative [Line Items]    
Exchange rates | € / £ 2.0297  
Australian Dollars | Purchase hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 2.2 £ 1.0
Australian Dollars | Purchase hedges | Minimum    
Derivative [Line Items]    
Exchange rates 2.0111 2.0073
Australian Dollars | Purchase hedges | Maximum    
Derivative [Line Items]    
Exchange rates 2.0111 2.0177
Canadian Dollars | Sales hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 0.3 £ 0.2
Exchange rates 1.8371 1.7969
Canadian Dollars | Purchase hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 15.6 £ 15.6
Canadian Dollars | Purchase hedges | Minimum    
Derivative [Line Items]    
Exchange rates 1.8454 1.7451
Canadian Dollars | Purchase hedges | Maximum    
Derivative [Line Items]    
Exchange rates 1.8305 1.8137
Euros | Purchase hedges    
Derivative [Line Items]    
Contract totals/£m | £ £ 0.8 £ 0.8
Exchange rates | € / £ 1.1445  
Euros | Purchase hedges | Minimum    
Derivative [Line Items]    
Exchange rates | € / £   1.2104