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Segment reporting - Geographical information (Details) - EUR (€)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disclosure of geographical areas [line items]        
Revenue € 540.3 € 530.6 € 1,695.9 € 1,558.0
United Kingdom        
Disclosure of geographical areas [line items]        
Revenue 165.0 160.8 514.8 400.1
Italy        
Disclosure of geographical areas [line items]        
Revenue 84.2 81.3 284.1 279.9
Germany        
Disclosure of geographical areas [line items]        
Revenue 75.1 68.9 237.3 223.9
Sweden        
Disclosure of geographical areas [line items]        
Revenue 44.0 48.8 133.1 143.3
France        
Disclosure of geographical areas [line items]        
Revenue 41.5 40.0 125.8 125.8
Norway        
Disclosure of geographical areas [line items]        
Revenue 29.8 31.8 88.8 91.2
Austria        
Disclosure of geographical areas [line items]        
Revenue 21.6 21.3 76.4 71.7
Spain        
Disclosure of geographical areas [line items]        
Revenue 20.8 19.5 60.2 57.6
Rest of Europe        
Disclosure of geographical areas [line items]        
Revenue € 58.3 € 58.2 € 175.4 € 164.5