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Issued share capital, share premium account and share options - Range of exercise price (Details)
€ / shares in Units, € in Millions, Options in Millions
12 Months Ended
Mar. 31, 2025
EUR (€)
Options
€ / shares
Mar. 31, 2024
EUR (€)
Options
€ / shares
Mar. 31, 2023
EUR (€)
Options
€ / shares
Mar. 31, 2022
Options
€ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Weighted-average exercise price | € / shares € 11.12 € 11.18 € 11.24 € 10.57
Number of options outstanding | Options 16.2 16.6 18.7 22.8
Weighted average remaining contractual life 3 years 10 months 24 days      
Share based payments | € € 12.8 € (3.9) € 16.2  
Share-based payment arrangements, service period for option plan 5 years      
LTIP 2019        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Share-based payment arrangements, service period for share award plan 3 years      
Exercise price of 11.12 | Unvested share options        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Exercise price | € / shares € 11.12      
Number of options outstanding | Options 16.0      
Weighted average remaining contractual life 3 years 10 months 24 days      
Exercise price of 11.12 | Vested share options        
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Exercise price | € / shares € 11.12      
Number of options outstanding | Options 0.2      
Weighted average remaining contractual life 10 months 24 days