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Employee benefits - History of Experience Adjustments From Inception (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations € 244.2 € 276.2 € 237.5
Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations 233.1 267.2 228.5
Experience losses/(gains) on plan liabilities 1.8 (0.8) 0.2
Experience gains on plan assets (9.6) (0.4) (5.1)
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations 352.6 374.1 323.9
Present value of defined benefit obligation | Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations 341.5 365.1 314.9
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations (108.4) (97.9) (86.4)
Plan assets | Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net employee benefit obligations € (108.4) € (97.9) € (86.4)