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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, 2022
Mar. 31, 2021
Mar. 31, 2020
Balance at beginning of year € 1,161.6 € 738.5  
Balance at end of year 1,328.2 1,161.6 € 738.5
Share Premium Account      
Balance at beginning of year 1,161.6 738.5 719.4
Net proceeds from shares issued 46.8 423.1 19.1
Non-cash movement in share premium 119.8    
Balance at end of year € 1,328.2 € 1,161.6 € 738.5