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Issued share capital, share premium account and share options - Share capital (Details) - EUR (€)
€ / shares in Units, € in Millions, shares in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of classes of share capital [line items]      
Amount returned to shareholders € 580.5 € 531.6 € 829.1
Cancellation of shares 47.2 37.8 46.7
Ordinary shares      
Disclosure of classes of share capital [line items]      
New issue 3.0 0.0 0.0
Class B share      
Disclosure of classes of share capital [line items]      
Par value € 0.00050 € 0.00050 € 0.00050
Deferred Share      
Disclosure of classes of share capital [line items]      
Par value € 0.00050 € 0.00050 € 0.00050