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Financial instruments - Fair value and risk management - Gross amounts for hedged items (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Total cash flow hedge reserve € (21.0) € 266.0 € 31.0
Gross      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedge reserve, continuing hedges 112.5 (140.5) (79.3)
Cash flow hedge reserve, balance remaining (76.1) (142.6) 83.1
Total cash flow hedge reserve 36.4 (283.1) 3.8
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Deferred tax included in hedge reserve (15.0) 17.0 28.0
Foreign currency risk | Property, plant and equipment - aircraft additions | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedge reserve, continuing hedges (7.7) (30.0) 265.6
Cash flow hedge reserve, balance remaining (76.1) (142.6) 83.1
Total cash flow hedge reserve (83.8) (172.6) 348.7
Foreign currency risk | Fuel and oil operating expenses | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedge reserve, continuing hedges (84.7) (83.7) (38.2)
Total cash flow hedge reserve (84.7) (83.7) (38.2)
Interest rate risk | Variable-rate instruments | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedge reserve, continuing hedges     (6.6)
Total cash flow hedge reserve     (6.6)
Commodity price risk | Fuel and carbon operating expenses | Gross      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedge reserve, continuing hedges 204.9 (26.8) (300.1)
Total cash flow hedge reserve € 204.9 € (26.8) € (300.1)