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Segment reporting - Additional Information (Details) - EUR (€)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating Segments [Abstract]        
adjustments for share based payments including employer tax € 6.5 € 4.5 € 16.2 € 10.9
Acquisition related costs € 2.8 € 0.7 € 3.1 € 8.9