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Shareholder returns - (Details) - EUR (€)
€ in Millions, shares in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
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  
886 million share buyback program      
Classes of share capital      
Number of shares bought back     46.7
Total cost of buyback     € 829.0
Shares buyback (as a percent)     3.80%
Number of shares cancelled     46.7
000 million share buyback program      
Classes of share capital      
Number of shares bought back 47.2 37.8  
Total cost of buyback € 581.0 € 561.0  
Shares buyback (as a percent) 4.20% 3.20%  
Number of shares cancelled 47.2 37.8