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Accounting policies (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
segment
Dec. 31, 2020
EUR (€)
Jun. 01, 2015
EUR (€)
Disclosure of detailed information about property, plant and equipment [line items]      
Trade receivables € 372.7 € 341.7  
Founder Preferred Shares Dividend Reserve € 166.0 245.5 € 531.5
Number of operating segments | segment 1    
Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Trade receivables € 376.3 € 346.1  
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 10 years    
Brands      
Disclosure of detailed information about intangible assets [line items]      
Years established 20 years    
Customer relationships      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets useful life 14 years