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Financial instruments - Fair values and risk management - Reclassified from OCI to Income statement (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains)/losses recognized in fuel and oil operating and finance expenses € (225.9) € (229.8) € 249.2
Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains)/losses recognized in fuel and oil operating and finance expenses (268.6) (261.6) 284.8
Cash Flow Hedges | Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains)/losses recognized in fuel and oil operating and finance expenses (263.5) (254.8) 293.0
Cash Flow Hedges | Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains)/losses recognized in fuel and oil operating and finance expenses 0.1 0.2 0.6
Cash Flow Hedges | Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains)/losses recognized in fuel and oil operating and finance expenses € (5.2) € (7.0) € (8.8)