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Financial instruments - Fair value and risk management - Derivative financial instruments designated in cash flow hedges (Details) - Cash Flow Hedges - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets (liabilities), net € (117.4) € 170.7 € (51.1)
Foreign currency risk | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets (liabilities), net 7.7 60.3 269.6
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets (liabilities), net 79.8 83.6 (38.2)
Interest rate risk | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets (liabilities), net     3.6
Commodity price risk | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets (liabilities), net € (204.9) € 26.8 € (286.1)