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Issued share capital, share premium account and share options - Share price (Details)
Options in Millions
12 Months Ended
Mar. 31, 2025
Options
€ / shares
Mar. 31, 2024
Options
€ / shares
Mar. 31, 2023
Options
€ / shares
Disclosure of classes of share capital [line items]      
Closing share price € 18.63 € 21.06 € 14.95
Number of options exercisable | Options 0.2 0.2 1.7
Number of options exercised | Options 0.4 1.4 4.1
Share options and LTIP grants      
Disclosure of classes of share capital [line items]      
Number of options exercised | Options 1.0 1.4 4.1
Minimum      
Disclosure of classes of share capital [line items]      
Share price during period € 13.41 € 13.96 € 10.09
Maximum      
Disclosure of classes of share capital [line items]      
Share price during period 21.8 21.49 15.76
Average      
Disclosure of classes of share capital [line items]      
Share price during period € 18.14 € 17.09 € 13.2