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Translation reserve Translation reserve table (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reserves within equity [line items]        
Reserve of exchange differences on translation, continuing hedges € 3.8 € 15.8    
Gains (losses) on exchange differences on translation, before tax 19.2 2.2 € (8.9)  
Gains (losses) on hedges of net investments in foreign operations, net of tax (13.2) 3.4 8.1  
Other comprehensive (loss)/income for the year (44.9) 7.5 (11.3)  
Equity attributable to owners of parent 2,557.9 2,059.9    
Reserve of exchange differences on translation, hedging relationships for which hedge accounting is no longer applied 46.4 47.6    
Translation reserve        
Disclosure of reserves within equity [line items]        
Equity attributable to owners of the parent (restated)   88.8 83.2  
Other comprehensive (loss)/income for the year 6.0 5.6 (0.8)  
Equity attributable to owners of parent 94.8 88.8 83.2 € 84.0
GBP net investments [Member]        
Disclosure of reserves within equity [line items]        
Gains (losses) on exchange differences on translation, net of tax € 19.0 € 3.7 € 8.7