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Employee benefits - Expense Recognized (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost € 4.2 € 3.8
Interest cost 3.6 3.6
Post-employment benefit expense 7.8 7.4
Defined benefit retirement plans    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 4.0 3.9
Interest cost 3.6 3.6
Post-employment benefit expense 7.6 7.5
Post-employment medical benefits and other benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 0.2 (0.1)
Current Service Cost, post employment medical benefit, net defined benefit 0.2 (0.1)
Interest cost 0.0 0.0
Post-employment benefit expense € 0.2 € (0.1)