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Financial instruments - Fair values and risk management - Hedge discontinuance and ineffectiveness (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end € (147.4) € (353.5)  
Gain recognized in the cash flow hedge reserve of continuing hedges 109.0    
Balance remaining in the cash flow hedge reserve from hedging relationship for which hedge accounting is no longer applied 102.0    
Total 211.0 (111.0) € 275.0
Hedge ineffectiveness recognized in profit or loss (200.0) (407.0)  
Jet fuel risk      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 192.0 447.0 0.0
Currency Cash Flow Hedges      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 8.0 40.0  
Jet Fuel Hedges      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 219.0    
Foreign currency forward contracts      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 58.0    
Jet Fuel Swaps      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 161.0    
Cash Flow Hedges      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end 131.7 (558.8) 338.4
Change in value used for calculating hedge ineffectiveness (541.5) 228.3 424.8
Balance remaining in the cash flow hedge reserve from hedging relationship for which hedge accounting is no longer applied 102.3 47.8  
Total 216.7 (163.5) 316.9
Cash flow hedge reserve 114.4 (211.3) 316.9
Changes in fair value recognized in OCI 541.5 (228.3) (445.0)
Hedge ineffectiveness recognized in profit or loss (171.8) (407.2)  
Reclassified from hedging reserve to profit or loss (258.2) (261.6) (284.8)
Deferred taxes included in hedge reserves 0.0 0.0 42.0
Cash Flow Hedges | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Hedge ineffectiveness recognized in profit or loss 8.0 40.0 0.0
Cash Flow Hedges | Aircraft purchases contract | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end 170.1 495.3 284.7
Change in value used for calculating hedge ineffectiveness 356.7 (170.8) 697.7
Balance remaining in the cash flow hedge reserve from hedging relationship for which hedge accounting is no longer applied 102.3 47.8  
Total 242.0 454.1 284.6
Cash flow hedge reserve 139.7 406.3 284.6
Changes in fair value recognized in OCI (356.7) 170.8 (697.7)
Hedge ineffectiveness recognized in profit or loss 38.4 40.0  
Cash Flow Hedges | Fuel and oil operating expenses | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end (27.0) 166.2 235.0
Change in value used for calculating hedge ineffectiveness 210.6 131.0 425.2
Total (10.6) 97.0 235.0
Cash flow hedge reserve (10.6) 97.0 235.0
Changes in fair value recognized in OCI (210.6) (131.0) (425.2)
Hedge ineffectiveness recognized in profit or loss (57.1) 69.2  
Reclassified from hedging reserve to profit or loss 5.2 (7.0) 8.8
Cash Flow Hedges | Fuel and oil operating expenses | Commodity risk      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end (19.8) (1,228.3) (185.3)
Change in value used for calculating hedge ineffectiveness (1,108.5) 271.9 (688.0)
Total (14.0) (711.8) (185.3)
Cash flow hedge reserve (14.0) (711.8) (185.3)
Changes in fair value recognized in OCI 1,108.5 (271.9) 688.0
Hedge ineffectiveness recognized in profit or loss (153.1) (516.4)  
Reclassified from hedging reserve to profit or loss (263.5) (254.8) (293.0)
Cash Flow Hedges | GBP Currency Swaps | Foreign currency risk      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end 5.4    
Change in value used for calculating hedge ineffectiveness (5.4)    
Total 5.4    
Cash flow hedge reserve 5.4    
Changes in fair value recognized in OCI 5.4    
Cash Flow Hedges | Variable-rate instruments | Interest rate risk      
Disclosure of detailed information about hedges [line items]      
Net derivative position at year end 3.0 8.0 4.0
Change in value used for calculating hedge ineffectiveness 5.1 (3.8) (10.1)
Total (6.1) (2.8) (17.4)
Cash flow hedge reserve (6.1) (2.8) (17.4)
Changes in fair value recognized in OCI (5.1) 3.8 (10.1)
Reclassified from hedging reserve to profit or loss € 0.1 € 0.2 € (0.6)