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Share-based compensation - Valuation Assumptions (Details) - EUR (€)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)	3.16%	0.51%	(0.56%)
Expected volatility (%)	28.90%	36.90%	35.10%
Share options, 3-year
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)		2.08%	(0.61%)
Expected dividend payments over the expected life (€)		€ 4.06	€ 3.25
Expected volatility (%)		26.40%	23.50%
Expected life term (years)		3 years	3 years
Share options, 5-year
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)		2.24%	(0.43%)
Expected dividend payments over the expected life (€)		€ 7.05	€ 5.65
Expected volatility (%)		24.20%	21.20%
Expected life term (years)		5 years	5 years
Share option | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Participant saving period	3 years

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- Definition

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+ References

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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