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Financial instruments - Fair values and risk management - Interest rate re-pricing (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 4,675.0 € 3,625.8 € 3,150.3
Cash and cash equivalents | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 3,599.3 2,669.0 2,650.7
Cash > 3 months | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 1,056.2 934.1 465.5
Restricted cash | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 19.5 € 22.7 € 34.1
Cash and liquid resources      
Disclosure of detailed information about financial instruments [line items]      
Weighted average interest rate on financial assets 3.02% (0.31%) (0.26%)
Current financial assets € 4,675.0 € 3,626.0 € 3,150.0