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Debt - Senior Unsecured Notes - Additional Information (Detail) - Unsecured Debt - GBP (£)
Mar. 26, 2021
Mar. 24, 2021
Debt Instrument [Line Items]    
Senior unsecured notes face amount   £ 850,000,000
Interim Credit Facility [Member]    
Debt Instrument [Line Items]    
Payoff of credit facility £ 850,000,000  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit £ 340,000,000