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Financial instruments - Fair values and risk management - Interest rate re-pricing (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 3,625.8 € 3,150.3 € 3,808.0
Cash and cash equivalents | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 2,669.0 2,650.7 2,566.4
Cash > 3 months | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 934.1 465.5 1,207.2
Restricted cash | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 22.7 € 34.1 € 34.4
Cash and liquid resources      
Disclosure of detailed information about financial instruments [line items]      
Weighted average interest rate on financial assets (0.31%) (0.26%) 0.73%
Current financial assets € 3,626.0 € 3,150.0 € 3,808.0