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Financial instruments - Fair values and risk management - Derivative arrangements (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]      
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss € (200.0) € (407.0)  
Gains (losses) on cash flow hedges, net of tax 691.1 197.4 € 325.5
Derivative financial assets 217.3 671.7 536.2
Derivative financial liabilities 85.6 1,230.5 197.7
Fuel and oil operating expenses      
Disclosure of detailed information about financial instruments [line items]      
Net Derivative financial instrument asset (liability) 46.0 1,228.0  
Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss 58.0    
Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss (171.8) (407.2)  
Derivative financial assets € 170.4 € 562.5 € 536.2