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Financial instruments - Fair values and risk management - Hedge discontinuance and ineffectiveness (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about hedges [line items]      
Total € 31.0 € 1,295.0 € 211.0
Cash Flow Hedges      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end     (171.8)
Change in gross value used for calculating hedge ineffectiveness 3,622.4 (1,020.9) (541.5)
Deferred taxes included in hedge reserves € 28.0 € 150.0 € 5.0