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Accounting policies (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2019
EUR (€)
segment
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
Jun. 01, 2015
EUR (€)
Accounting Policies, Changes in Accounting Estimates and Errors [Abstract]        
Foreign exchange rate 1.17 1.11 1.13  
Disclosure of detailed information about property, plant and equipment [line items]        
Trade receivables € 334.8 € 257.1    
Founder Preferred Shares Dividend Reserve € 370.1 372.6   € 531.5
Number of operating segments | segment 1      
Cost        
Disclosure of detailed information about property, plant and equipment [line items]        
Trade receivables € 339.6 € 261.4    
Buildings        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful life 40 years      
Plant and equipment | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful life 5 years      
Plant and equipment | Top of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful life 14 years      
Computer equipment | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful life 3 years      
Computer equipment | Top of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful life 5 years      
Computer software | Bottom of range        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets useful life 5 years      
Computer software | Top of range        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets useful life 7 years      
Brands        
Disclosure of detailed information about intangible assets [line items]        
Years established 50 years      
Customer relationships        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets useful life 14 years