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Shareholder returns - (Details) - EUR (€)
€ in Millions, shares in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Classes of share capital      
Amount returned to shareholders € 0.0 € 0.0 € 580.5
Number of shares bought back     47.2
Repurchase of Ordinary Equity Shares € 0.0 € 0.0 € 580.5
Percentage of total share capital bought back     4.20%
Cancellation of repurchased ordinary shares (Shares)     (47.2)
Issued Share Capital      
Classes of share capital      
Cancellation of repurchased ordinary shares (Shares)     (47.2)
Cancellation of repurchased ordinary shares     € (0.3)
Other Undominated Capital      
Classes of share capital      
Cancellation of repurchased ordinary shares     € 0.3