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Derivative financial instruments - Nominal Amount (Details) - Cash Flow Hedges - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Aircraft purchases contract | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Nominal amount € 4,283.5 € 5,437.8 € 6,309.9
Aircraft purchases contract | Foreign currency risk | Less than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount 1,519.8 1,455.8 1,117.7
Aircraft purchases contract | Foreign currency risk | More than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount 2,763.7 3,982.0 5,192.2
Fuel and oil operating expenses | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Nominal amount 1,312.0 3,234.8 3,192.7
Fuel and oil operating expenses | Foreign currency risk | Less than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount   2,515.9 2,046.0
Fuel and oil operating expenses | Foreign currency risk | More than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount 1,312.0 718.9 1,146.7
Fuel and oil operating expenses | Commodity risk      
Disclosure of detailed information about hedges [line items]      
Nominal amount 672.7 2,482.1 1,272.4
Fuel and oil operating expenses | Commodity risk | Less than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount   2,482.1 1,272.4
Fuel and oil operating expenses | Commodity risk | More than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount 672.7    
Variable-rate instruments | Interest rate risk      
Disclosure of detailed information about hedges [line items]      
Nominal amount 64.8 77.8 90.6
Variable-rate instruments | Interest rate risk | Less than one year      
Disclosure of detailed information about hedges [line items]      
Nominal amount € 64.8 € 77.8 € 90.6