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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges € 1,821.6 € 184.0 € (258.2)
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 1,821.6 184.0 (258.2)
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 261.2 7.4 5.2
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 261.2 3.2 5.2
Foreign currency risk | Cash Flow Hedges | GBP currency swap      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges   4.2  
Interest rate risk | Finance expense      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 2.9 0.1 0.1
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 2.9 0.1 0.1
Commodity price risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 1,557.5 176.5 (263.5)
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 € 1,557.5 € 176.5 € (263.5)