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Issued share capital, share premium account and share options - Share options and share purchase arrangements (Details)
Options in Millions, EquityInstruments in Millions
12 Months Ended
Mar. 31, 2022
Options
EquityInstruments
€ / shares
Mar. 31, 2021
Options
€ / shares
Mar. 31, 2020
Options
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share options outstanding at beginning of year | Options 30.0 34.8 39.8
Share options forfeited | Options (0.7) (1.2) (2.0)
Share options exercised | Options (6.5) (3.6) (3.0)
Share options outstanding at end of year | Options 22.8 30.0 34.8
Weighted average exercise price, share options outstanding at beginning of year | € / shares € 9.83 € 9.57 € 9.38
Weighted average exercise price, share options forfeited | € / shares 12.98 11.56 12.47
Weighted average exercise price, share options exercised | € / shares 7.23 6.42 6.31
Weighted average exercise price, share options outstanding at end of year | € / shares € 10.57 € 9.83 € 9.57
LTIP 2019 | Cumulative conditional ordinary shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Shares granted, outstanding | EquityInstruments 0.9    
Option plan 2013      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum ownership percentage of entity's total shares for individual under share-based payment arrangement 5.00%