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Segment reporting - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2019
EUR (€)
segment
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Operating Segments [Abstract]      
Number of operating segments | segment 1    
adjustments for share based payments including employer tax € 22.4 € 14.7 € 2.6
Adjustments for acquisition related costs € 3.3 € 8.9 € 3.0