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Employee benefits - History of Experience Adjustments From Inception (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value € 320.0 € 279.0 € 266.7
Plan assets, at fair value 86.4 81.5  
Recognized liability for net defined benefit obligations 233.6 197.5 185.4
Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [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)
Recognized liability for net defined benefit obligations 228.5 192.7 180.5
Experience losses on scheme liabilities 0.2 0.5 0.5
Experience gains on scheme assets (5.1) (0.3) (1.9)
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net defined benefit obligations 237.5 200.6  
Present value of defined benefit obligation | Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net defined benefit obligations 314.9 274.2 261.8
Plan assets [member] | Defined benefit retirement plans      
Disclosure of net defined benefit liability (asset) [line items]      
Recognized liability for net defined benefit obligations € (86.4) € (81.5) € (81.3)