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Issued share capital, share premium account and share options - Share premium account (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Issued share capital, share premium account and share options    
Balance at beginning of year € 738.5 € 719.4
Issue of ordinary equity shares 423.1 19.1
Balance at end of year € 1,161.6 € 738.5