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Financial instruments - Fair value and risk management - Cash flow hedges reclassified from OCI to income statement (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges € (33.5) € 71.2 € 1,821.6
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 33.5 (71.2) 1,821.6
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges (110.9) (4.2) 261.2
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 110.9 4.2 261.2
Interest rate risk | Finance expense      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges   3.6 2.9
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges   (3.6) 2.9
Commodity price risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 77.4 71.8 1,557.5
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges € (77.4) € (71.8) € 1,557.5