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Post-balance sheet events (Details) - EUR (€)
€ in Millions
 1 Months Ended 12 Months Ended
May 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Post-balance sheet events        
Amount of financing raised   € 400    
Interest rate percentage   (0.26%) 0.73% 0.01%
0.875% unsecured Eurobonds        
Post-balance sheet events        
Amount of financing raised € 1,200      
Term of debt   5 years    
Fixed rate        
Post-balance sheet events        
Interest rate percentage   1.40% 1.42% 1.48%
Fixed rate | 0.875% unsecured Eurobonds        
Post-balance sheet events        
Interest rate percentage   0.875%    
Debt from bank facility | 0.875% unsecured Eurobonds        
Post-balance sheet events        
Amount of financing raised € 1,200      
Term of debt 5 years      
Debt from bank facility | Fixed rate | 0.875% unsecured Eurobonds        
Post-balance sheet events        
Interest rate percentage 0.875%