Debt - 2.500% Senior Unsecured Notes Due 2028 - Additional Information (Detail) - 2.500% Senior Unsecured Notes due 2026 [Member] - GBP (£)			9 Months Ended
	Mar. 26, 2021	Mar. 24, 2021	Sep. 30, 2022		Dec. 31, 2021	[1]
Debt Instrument [Line Items]
Senior unsecured notes face amount		£ 500,000,000
Percentage of par value on senior notes		99.937%
Senior unsecured notes, payable term			interest on the notes is payable annually on March 24 of each year, commencing on March 24, 2022.
Debt instrument maturity date	Mar. 24, 2026	Mar. 24, 2026
Senior unsecured notes, interest rate	2.50%	2.50%	2.50%	[1]	2.50%

[1] Non-U.S. dollar denominated debt reflects the exchange rate at September 30, 2022 and December 31, 2021.