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Employee benefits - Fair Value of Plan Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Employee Benefits [Abstract]    
Equities € 32.7 € 24.5
Debt instruments 42.7 44.1
Property 20.3 17.1
Other 12.7 12.2
Total € 108.4 € 97.9