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Financial instruments - Fair value and risk management - Summary of derivative financial instruments (Details) - EUR (€)
€ in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets € 1,585.5 € 217.3 € 671.7
Derivative financial liabilities (38.6) (85.6) (1,230.5)
Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (7.5) (37.5) (714.0)
Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities   (22.4) (516.5)
Designated as fair value financial instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (31.1) (25.7)  
Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 1,393.7 170.4 562.5
Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 41.2 46.9 109.2
Designated as fair value financial instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 150.6    
Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 1,400.4 106.0 293.2
Derivative financial liabilities (38.6) (79.2) (1,050.0)
Less than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (7.5) (36.9) (533.5)
Less than one year | Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities   (22.4) (516.5)
Less than one year | Designated as fair value financial instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities (31.1) (19.9)  
Less than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 1,208.6 72.3 184.0
Less than one year | Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 41.2 33.7 109.2
Less than one year | Designated as fair value financial instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 150.6    
More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 185.1 111.3 378.5
Derivative financial liabilities   (6.4) (180.5)
More than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities   (0.6) (180.5)
More than one year | Designated as fair value financial instruments      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial liabilities   (5.8)  
More than one year | Designated as continuing cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 185.1 98.1 378.5
More than one year | Where hedge accounting is no longer applied      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets   13.0  
Foreign currency risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 474.1 214.3 663.7
Derivative financial liabilities (31.0) (65.8) (2.2)
Net derivative financial assets (liabilities) 443.1 148.5 661.5
Foreign currency risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 313.7 104.9 291.2
Derivative financial liabilities (31.0) (59.4) (2.2)
Net derivative financial assets (liabilities) 282.7 45.5 289.0
Foreign currency risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 160.4 109.4 372.5
Derivative financial liabilities   (6.4)  
Net derivative financial assets (liabilities) 160.4 103.0 372.5
Foreign currency risk | Cash Flow Hedges | Aircraft purchases contract      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 4,180.3 3,568.4 4,283.5
Foreign currency risk | Cash Flow Hedges | Aircraft purchases contract | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 2,082.4 1,632.7 1,519.8
Foreign currency risk | Cash Flow Hedges | Aircraft purchases contract | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 2,097.9 1,935.7 2,763.7
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 2,151.8 1,202.2 1,312.0
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 2,151.8 1,202.2  
Foreign currency risk | Cash Flow Hedges | Fuel and oil operating expenses | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount     1,312.0
Foreign currency risk | Cash Flow Hedges | GBP Currency Swaps      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount   695.3  
Foreign currency risk | Cash Flow Hedges | GBP Currency Swaps | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount   695.3  
Interest rate risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 4.4 3.0 8.0
Interest rate risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 1.9 1.0 2.0
Interest rate risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 2.5 2.0 6.0
Interest rate risk | Cash Flow Hedges | Variable-rate instruments      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 43.5 51.6 64.8
Interest rate risk | Cash Flow Hedges | Variable-rate instruments | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 12.1 13.4 64.8
Interest rate risk | Cash Flow Hedges | Variable-rate instruments | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 31.4 38.2  
Commodity price risk | Cash Flow Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 956.3    
Derivative financial liabilities (7.5) (19.8) (1,230.5)
Net derivative financial assets (liabilities) 948.8 (19.8) (1,230.5)
Commodity price risk | Cash Flow Hedges | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 934.1    
Derivative financial liabilities (7.5) (19.8) (1,047.8)
Net derivative financial assets (liabilities) 926.6 (19.8) (1,047.8)
Commodity price risk | Cash Flow Hedges | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Derivative financial assets 22.2    
Derivative financial liabilities     (180.5)
Net derivative financial assets (liabilities) 22.2   (180.5)
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 2,055.6 577.6 672.7
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses | Less than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount 1,901.0 € 577.6  
Commodity price risk | Cash Flow Hedges | Fuel and carbon operating expenses | More than one year      
Disclosure of detailed information about hedging instruments [line items]      
Notional amount € 154.6   € 672.7