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Derivative financial instruments - Reclassified from OCI to Income statement (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains) recognized in fuel and oil operating and finance expenses € (229.8) € 249.2 € 119.5
Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains) recognized in fuel and oil operating and finance expenses (261.6) 284.8 136.6
Cash Flow Hedges | Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains) recognized in fuel and oil operating and finance expenses (254.8) 293.0 134.6
Cash Flow Hedges | Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains) recognized in fuel and oil operating and finance expenses 0.2 0.6 2.6
Cash Flow Hedges | Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Reclassification adjustments for (gains) recognized in fuel and oil operating and finance expenses € (7.0) € (8.8) € (0.6)