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Employee benefits - Defined Benefit Obligation Sensitivity Analysis (Details)
€ in Millions
Dec. 31, 2019
EUR (€)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage of reasonably possible increase in actuarial assumption 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Effect on the post-employment benefit obligation with a 1% increase € (51.4)
Effect on the post-employment benefit obligation with a 1% decrease 68.1
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 43.5
Effect on the post-employment benefit obligation with a 1% decrease (35.4)
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 16.6
Effect on the post-employment benefit obligation with a 1% decrease (12.3)
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 44.9
Effect on the post-employment benefit obligation with a 1% decrease € (36.3)