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Cash flow hedging reserve (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [line items]        
Reserve of cash flow hedges € (13.2) € 8.5 € (3.0) € 8.4
Change in fair value of hedging instrument recognized in OCI in the year 31.9 69.8 (76.5)  
Reclassified to cost of goods sold (21.8) (6.4) 3.8  
Reclassified from other comprehensive income to finance costs (37.4) (47.9) 56.3  
Deferred tax income (expense) on cash flow hedge reserve 5.6 (4.0) 5.0  
Swap contract [member]        
Disclosure of detailed information about hedges [line items]        
Reserve of cash flow hedges (6.8) 0.9 (0.4) 0.0
Change in fair value of hedging instrument recognized in OCI in the year 28.1 49.5 (56.8)  
Reclassified to cost of goods sold 0.0 0.0 0.0  
Reclassified from other comprehensive income to finance costs (37.4) (47.9) 56.3  
Deferred tax income (expense) on cash flow hedge reserve 1.6 (0.3) 0.1  
Forward contract [member]        
Disclosure of detailed information about hedges [line items]        
Reserve of cash flow hedges (6.4) 7.6 (2.6) € 8.4
Change in fair value of hedging instrument recognized in OCI in the year 3.8 20.3 (19.7)  
Reclassified to cost of goods sold (21.8) (6.4) 3.8  
Reclassified from other comprehensive income to finance costs 0.0 0.0 0.0  
Deferred tax income (expense) on cash flow hedge reserve € 4.0 € (3.7) € 4.9