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Employee benefits - Amount Included in the Statement of Financial Position Arising from the Company's Obligations (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value € 320.0 € 279.0 € 266.7
Plan assets, at fair value 86.4 81.5  
Net defined benefit liability (asset) 233.6 197.5 185.4
Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 314.9 274.2 261.8
Plan assets, at fair value (86.4) (81.5) (81.3)
Net defined benefit liability (asset) 228.5 192.7 180.5
Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 5.1 4.8 4.9
Net defined benefit liability (asset) 5.1 4.8 € 4.9
Present value of defined benefit obligation      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 320.0 279.0  
Present value of defined benefit obligation | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 314.9 274.2  
Present value of defined benefit obligation | Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 5.1 4.8  
Present value of defined benefit obligation | Unfunded Plan      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 82.7 70.6  
Present value of defined benefit obligation | Unfunded Plan | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 77.6 65.8  
Present value of defined benefit obligation | Unfunded Plan | Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 5.1 4.8  
Present value of defined benefit obligation | Funded Plan      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 237.3 208.4  
Present value of defined benefit obligation | Funded Plan | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 237.3 208.4  
Present value of defined benefit obligation | Funded Plan | Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 0.0 0.0  
Plan assets [member]      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value (86.4) (81.5)  
Plan assets [member] | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value (86.4) (81.5)  
Plan assets [member] | Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value € 0.0 € 0.0