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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, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges € 184.0 € (258.2) € (261.6)
Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 184.0 (258.2) (261.6)
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 7.4 5.2 (7.0)
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 3.2 5.2 (7.0)
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 0.1 0.1 0.2
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 0.1 0.1 0.2
Commodity price risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Reclassification adjustments, cash flow hedges 176.5 (263.5) (254.8)
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 € 176.5 € (263.5) € (254.8)