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Segment reporting - Geographical information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]      
Revenue € 2,324.3 € 2,172.8 € 1,956.6
Non-current assets 478.3 426.0  
United Kingdom      
Disclosure of geographical areas [line items]      
Revenue 712.5 585.4 411.9
Non-current assets 131.3 141.5  
Italy      
Disclosure of geographical areas [line items]      
Revenue 394.1 383.6 371.4
Non-current assets 68.2 52.5  
Germany      
Disclosure of geographical areas [line items]      
Revenue 329.6 310.2 300.3
Non-current assets 124.9 121.8  
Sweden      
Disclosure of geographical areas [line items]      
Revenue 175.7 192.7 208.0
Non-current assets 51.1 26.5  
France      
Disclosure of geographical areas [line items]      
Revenue 176.6 174.1 170.0
Non-current assets 17.2 17.0  
Norway      
Disclosure of geographical areas [line items]      
Revenue 120.4 122.5 123.3
Non-current assets 29.6 14.3  
Austria      
Disclosure of geographical areas [line items]      
Revenue 108.2 102.4 96.7
Spain      
Disclosure of geographical areas [line items]      
Revenue 79.5 76.7 81.2
Rest of Europe      
Disclosure of geographical areas [line items]      
Revenue 227.7 225.2 € 193.8
Non-current assets € 56.0 € 52.4