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Financial instruments - Fair value and risk management - Derivative financial instruments designated in cash flow hedges (Details) - Cash Flow Hedges - EUR (€)
€ in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges € 1,396.3 € 131.7 € (558.8)
Foreign currency risk | Property, plant and equipment - aircraft additions      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges 337.5 170.1 495.3
Foreign currency risk | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges 105.6 (27.0) 166.2
Foreign currency risk | GBP currency swap      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges   5.4  
Interest rate risk | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges 4.5 3.0 8.0
Commodity price risk | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial instruments designated as cash flow hedges € 948.7 € (19.8) € (1,228.3)