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Issued share capital, share premium account and share options - Share price (Details)
Options in Millions
12 Months Ended
Mar. 31, 2021
Options
€ / shares
Mar. 31, 2020
Options
€ / shares
Mar. 31, 2019
Options
€ / shares
Disclosure of classes of share capital [line items]      
Share price € 16.55 € 9.33 € 11.67
Average share price € 13.01 € 11.77 € 13.28
Number of options exercisable | Options 10.9 0.0 0.0
Number of options exercised | Options 3.6 3.0 0.0
Minimum      
Disclosure of classes of share capital [line items]      
Share price € 8.20 € 8.32 € 10.04
Maximum      
Disclosure of classes of share capital [line items]      
Share price € 17.56 € 16.07 € 16.72