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Employee benefits - Defined Benefit Obligation Sensitivity Analysis (Details)
€ in Millions
Dec. 31, 2021
EUR (€)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effect on the post-employment benefit obligation with a 1% increase € (54.6)
Effect on the post-employment benefit obligation with a 1% decrease 71.9
Actuarial assumption of expected rates of inflation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effect on the post-employment benefit obligation with a 1% increase 47.4
Effect on the post-employment benefit obligation with a 1% decrease (38.7)
Actuarial assumption of expected rates of salary increases [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effect on the post-employment benefit obligation with a 1% increase 15.2
Effect on the post-employment benefit obligation with a 1% decrease (11.5)
Actuarial assumption of expected rates of pension increases [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Effect on the post-employment benefit obligation with a 1% increase 47.6
Effect on the post-employment benefit obligation with a 1% decrease € (37.0)