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Shareholder returns - (Details) - EUR (€)
€ in Millions, shares in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Classes of share capital      
Decrease in share capital (in shares)   47.2 37.8
Nominal value decrease in share capital   € 0.3 € 0.2
Increase in other undenominated capital reserve   € 0.3 € 0.2
000 million share buyback program      
Classes of share capital      
Number of shares bought back   47.2 37.8
Total cost of buyback € 0.0 € 581.0 € 561.0
Shares buyback (as a percent)   4.20% 3.20%
Number of shares cancelled   47.2 37.8