Debt - 2.550% Senior Unsecured Notes Due 2023 - Additional Information (Detail) - 2.550% Senior Unsecured Notes due 2023 [Member] - GBP (£)		12 Months Ended
Dec. 05, 2019	Dec. 31, 2020
Debt Instrument [Line Items]
Senior unsecured notes face amount	£ 400,000,000
Senior unsecured notes, payable term		Interest on the notes is payable annually on December 5 of each year.
Debt instrument maturity date	Dec. 05, 2023

Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30
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Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.22(a)(2))
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