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Employee benefits - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Post-employment benefit expense, defined contribution plans € 10.2 € 8.3 € 9.0
Recognized liability for net employee benefit obligations 244.2 276.2 237.5
Estimate of contributions expected to be paid to plan for next annual reporting period € 6.7    
Weighted average duration of defined benefit obligation 18 years 10 months 24 days    
Present value of defined benefit obligation      
Disclosure of defined benefit plans [line items]      
Recognized liability for net employee benefit obligations € 352.6 374.1 € 323.9
Present value of defined benefit obligation | Other countries      
Disclosure of defined benefit plans [line items]      
Recognized liability for net employee benefit obligations € 8.7 € 4.0