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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Balance at beginning of year € 1,328.2 € 1,161.6  
Balance at end of year 1,379.9 1,328.2 € 1,161.6
Share Premium Account      
Balance at beginning of year 1,328.2 1,161.6 738.5
Net proceeds from shares issued 31.7 46.8 423.1
Share premium receivable on shares issued 20.0 119.8  
Balance at end of year € 1,379.9 € 1,328.2 € 1,161.6