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Financial instruments - Fair values and risk management - Impact on profit or loss (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]      
Assets measured at fair value € 217.3 € 671.7 € 536.2
Current derivative assets 106.0 293.2 308.7
Non-current derivative assets 111.3 378.5 227.5
Total derivative assets 217.3 671.7 536.2
Current derivative liabilities (79.2) (1,050.0) (189.7)
Non-current derivative liabilities (6.4) (180.5) (8.0)
Total derivative liabilities (85.6) (1,230.5) (197.7)
Net hedge ineffectiveness and discontinuation transferred to profit or loss (147.4) (353.5)  
Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative assets 106.0 293.2 308.7
Current derivative liabilities (79.2) (1,050.0) (189.7)
More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative assets 111.3 378.5 227.5
Non-current derivative liabilities (6.4) (180.5) (8.0)
Effective Hedge      
Disclosure of detailed information about financial instruments [line items]      
Total derivative liabilities (25.7)    
Effective Hedge | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative liabilities (19.9)    
Effective Hedge | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative liabilities (5.8)    
Ineffective Hedge      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 46.9 109.2  
Total derivative liabilities (22.4) (516.5)  
Ineffective Hedge | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative assets 33.7 109.2  
Current derivative liabilities (22.4) (516.5)  
Ineffective Hedge | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative assets 13.2    
Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 170.4 562.5 536.2
Net hedge ineffectiveness and discontinuation transferred to profit or loss 131.7 (558.8) 338.4
Cash Flow Hedges | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative assets 72.3 184.0 308.7
Cash Flow Hedges | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative assets 98.1 378.5 227.5
Cash Flow Hedges | Effective Hedge      
Disclosure of detailed information about financial instruments [line items]      
Total derivative liabilities (37.5) (714.0) (197.7)
Cash Flow Hedges | Effective Hedge | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative liabilities (36.9) (533.5) (189.7)
Cash Flow Hedges | Effective Hedge | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative liabilities (0.6) (180.5) (8.0)
Foreign currency risk      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 214.3 663.7 527.7
Total derivative liabilities (65.8) (2.2) (8.0)
Net derivative financial instrument position at year-end 148.5 661.5 519.7
Foreign currency risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative assets 104.9 291.2 307.0
Current derivative liabilities (59.4) (2.2)  
Net derivative financial instrument position at year-end 45.5 289.0 307.0
Foreign currency risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative assets 109.4 372.5 220.7
Non-current derivative liabilities (6.4)   (8.0)
Net derivative financial instrument position at year-end 103.0 372.5 212.7
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 3.0 8.0 4.0
Interest rate risk | Floating rate      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 51.6 64.8  
Notional Amount Net     (77.8)
Interest rate risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 1.0 2.0 1.7
Interest rate risk | Less than one year | Floating rate      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 13.4 64.8  
Notional Amount Net     (77.8)
Interest rate risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets 2.0 6.0 2.3
Interest rate risk | More than one year | Floating rate      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 38.2    
Commodity risk      
Disclosure of detailed information about financial instruments [line items]      
Total derivative assets     4.5
Total derivative liabilities (19.8) (1,228.3) (189.7)
Net derivative financial instrument position at year-end (19.8) (1,228.3) (185.2)
Commodity risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current derivative liabilities (19.8) (1,047.8) (189.7)
Net derivative financial instrument position at year-end (19.8) (1,047.8) (189.7)
Commodity risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-current derivative assets     4.5
Non-current derivative liabilities   (180.5)  
Net derivative financial instrument position at year-end   (180.5) 4.5
Aircraft purchases contract | Foreign currency risk      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 3,568.4 4,283.5 5,437.8
Aircraft purchases contract | Foreign currency risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 1,632.7 1,519.8 1,455.8
Aircraft purchases contract | Foreign currency risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 1,935.7 2,763.7 3,982.0
Aircraft purchases contract | Foreign currency risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Net hedge ineffectiveness and discontinuation transferred to profit or loss 170.1 495.3 284.7
Fuel and oil operating expenses      
Disclosure of detailed information about financial instruments [line items]      
Net derivative financial instrument position at year-end 46.0 1,228.0  
Fuel and oil operating expenses | Foreign currency risk      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 1,202.2 1,312.0 3,234.8
Fuel and oil operating expenses | Foreign currency risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 1,202.2   2,515.9
Fuel and oil operating expenses | Foreign currency risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount   1,312.0 718.9
Fuel and oil operating expenses | Foreign currency risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Net hedge ineffectiveness and discontinuation transferred to profit or loss (27.0) 166.2 235.0
Fuel and oil operating expenses | Commodity risk      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 577.6 672.7  
Notional Amount Net     (2,482.1)
Fuel and oil operating expenses | Commodity risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 577.6    
Notional Amount Net     (2,482.1)
Fuel and oil operating expenses | Commodity risk | More than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount   672.7  
Fuel and oil operating expenses | Commodity risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Net hedge ineffectiveness and discontinuation transferred to profit or loss (19.8) (1,228.3) (185.3)
GBP Currency Swaps | Foreign currency risk      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 695.3    
GBP Currency Swaps | Foreign currency risk | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 695.3    
GBP Currency Swaps | Foreign currency risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Net hedge ineffectiveness and discontinuation transferred to profit or loss 5.4    
Variable-rate instruments | Interest rate risk | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Net hedge ineffectiveness and discontinuation transferred to profit or loss € 3.0 € 8.0 € 4.0