Share-based compensation - Black-Scholes-Merton option pricing model inputs (Detail)	12 Months Ended
Dec. 31, 2023 € / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022
Share-based compensation [Line Items]
Risk free interest rate, share options granted	2.55%	2.55%
Expected volatility, share options granted			36.00%
Euro [Member]
Share-based compensation [Line Items]
Weighted average share price, share options granted	€ 22.16
Euro [Member] \| Retention option plan [Member]
Share-based compensation [Line Items]
Weighted average share price, share options granted	18.24
Exercise price, share options granted	€ 22.16
Risk free interest rate, share options granted	2.37%	2.37%
Expected dividend as percentage, share options granted	4.45%	4.45%
Option life, share options granted	6	6
Expected volatility, share options granted	30.47%	30.47%
US Dollar [Member] \| Retention option plan [Member]
Share-based compensation [Line Items]
Weighted average share price, share options granted \| $ / shares		$ 21.12
Exercise price, share options granted \| $ / shares		$ 24.42
Expected dividend as percentage, share options granted	4.45%	4.45%
Option life, share options granted	6	6
Expected volatility, share options granted	32.31%	32.31%
US Dollar [Member] \| Option plans [Member]
Share-based compensation [Line Items]
Risk free interest rate, share options granted	3.50%	3.50%

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The exercise price of share options granted.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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