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Share-based Payment Expense - Summary of Movement and Options Outstanding Under Share Option Schemes (Parenthetical) (Detail) - Share Option Schemes Excluding Savings Related Share Option Schemes [member]	12 Months Ended
	Dec. 31, 2021 yr € / shares	Dec. 31, 2020 € / shares	Dec. 31, 2019 € / shares
Disclosure Of Share Based Compensation Expense [line items]
Weighted average share price	€ 42.10	€ 31.70	€ 29.10
Description of option Life share options granted | yr	10
Exercise price of outstanding share options	€ 16.19	€ 16.19	€ 16.19

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- Definition

Disclosure of share-based compensation expense.

+ References

No definition available.

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2021-01-01
-Paragraph 47
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- Definition

The exercise price of outstanding share options.

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-IssueDate 2021-01-01
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- Definition

The weighted average share price. [Refer: Weighted average [member]]

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