Share-based compensation - Valuation Assumptions (Details) - EUR (€)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Performance shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)	4.44%	3.16%	0.51%
Expected volatility (%)	30.30%	28.90%	36.90%
Share options, 3-year
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)			2.08%
Expected dividend payments over the expected life (€)			€ 4.06
Expected volatility (%)			26.40%
Expected life term (years)			3 years
Share options, 5-year
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Risk-free interest rate (%)			2.24%
Expected dividend payments over the expected life (€)			€ 7.05
Expected volatility (%)			24.20%
Expected life term (years)			5 years
Share option | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Participant saving period	3 years