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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 60 Months Ended
Mar. 31, 2023
Options
€ / shares
Mar. 31, 2022
Options
€ / shares
Mar. 31, 2021
Options
€ / shares
Mar. 31, 2013
Mar. 31, 2023
EquityInstruments
Options
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share options outstanding at beginning of year | Options 22.8 30.0 34.8    
Share options forfeited | Options   (0.7) (1.2)    
Share options exercised | Options (4.1) (6.5) (3.6)    
Share options outstanding at end of year | Options 18.7 22.8 30.0   18.7
Weighted average exercise price, share options outstanding at beginning of year | € / shares € 10.57 € 9.83 € 9.57    
Weighted average exercise price, share options forfeited | € / shares   12.98 11.56    
Weighted average exercise price, share options exercised | € / shares 7.64 7.23 6.42    
Weighted average exercise price, share options outstanding at end of year | € / shares € 11.24 € 10.57 € 9.83   € 11.24
LTIP 2019          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares granted in share-based payment arrangement | EquityInstruments         0.9
Option plan 2013 | Maximum          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Maximum percentage of shares issued under plan in relation to outstanding ordinary shares       5.00%