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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Present value of defined benefit obligation      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value € 352.6 € 374.1  
Present value of defined benefit obligation | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 341.5 365.1  
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 11.1 9.0  
Present value of defined benefit obligation | Unfunded Plan      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 88.6 88.6  
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 77.5 79.6  
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 11.1 9.0  
Present value of defined benefit obligation | Funded Plan      
Disclosure of defined benefit plans [line items]      
Defined benefit obligation, at present value 264.0 285.5  
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 264.0 285.5  
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      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value (108.4) (97.9)  
Plan assets | Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value (108.4) (97.9)  
Plan assets | Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Plan assets, at fair value 0.0 0.0  
Plan assets, at fair value 108.4 97.9  
Net defined benefit liability (asset) 244.2 276.2 € 237.5
Defined benefit retirement plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 233.1 267.2 € 228.5
Post-employment medical benefits and other benefits      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) € 11.1 € 9.0