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Derivative financial instruments - Hedge discontinuance and ineffectiveness (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about hedges [line items]        
Net derivative position at year end   € (353.5)    
Total   (111.3) € 274.6 € (359.7)
Aircraft purchases contract | Foreign currency risk        
Disclosure of detailed information about hedges [line items]        
Changes in fair value recognized in OCI   170.8    
Hedge ineffectiveness recognized in profit or loss   40.0    
Fuel and oil operating expenses | Foreign currency risk        
Disclosure of detailed information about hedges [line items]        
Changes in fair value recognized in OCI   (131.0)    
Hedge ineffectiveness recognized in profit or loss   69.2    
Reclassified from hedging reserve to profit or loss   (7.0)    
Fuel and oil operating expenses | Commodity risk        
Disclosure of detailed information about hedges [line items]        
Change in value used for calculating hedge ineffectiveness   447.0    
Changes in fair value recognized in OCI   (271.9)    
Hedge ineffectiveness recognized in profit or loss   (516.4)    
Reclassified from hedging reserve to profit or loss   (254.8)    
Foreign currency forward contracts        
Disclosure of detailed information about hedges [line items]        
Hedge ineffectiveness recognized in profit or loss   0.0 0.0 0.0
Variable-rate instruments | Interest rate risk        
Disclosure of detailed information about hedges [line items]        
Changes in fair value recognized in OCI   3.8    
Reclassified from hedging reserve to profit or loss   0.2    
Cash Flow Hedges        
Disclosure of detailed information about hedges [line items]        
Net derivative position at year end   (558.8) 338.4 (391.3)
Change in value used for calculating hedge ineffectiveness   407.0    
Cash flow hedge reserve   (211.3)    
Balance remaining in the cash flow hedge reserve from hedging relationship for which hedge accounting is no longer applied   47.8    
Total   (163.5)    
Changes in fair value recognized in OCI   (228.3) (445.0) 832.9
Hedge ineffectiveness recognized in profit or loss   (407.2)    
Reclassified from hedging reserve to profit or loss   (261.6) (284.8) (136.6)
Deferred taxes included in hedge reserves   52.0 42.0 49.0
Cash Flow Hedges | Foreign currency risk        
Disclosure of detailed information about hedges [line items]        
Hedge ineffectiveness recognized in profit or loss € 40.0      
Cash Flow Hedges | Commodity risk        
Disclosure of detailed information about hedges [line items]        
Cash flow hedge reserve     316.9 (408.6)
Total     316.9 (408.6)
Hedge ineffectiveness recognized in profit or loss € 447.0      
Cash Flow Hedges | Aircraft purchases contract | Foreign currency risk        
Disclosure of detailed information about hedges [line items]        
Net derivative position at year end   495.3 284.7 (413.0)
Change in value used for calculating hedge ineffectiveness   (170.8) 697.7 (563.7)
Cash flow hedge reserve   406.3 284.6 (413.0)
Balance remaining in the cash flow hedge reserve from hedging relationship for which hedge accounting is no longer applied   47.8    
Total   454.1 284.6 (413.0)
Changes in fair value recognized in OCI     (697.7) 563.7
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   166.2 235.0 (181.4)
Change in value used for calculating hedge ineffectiveness   131.0 425.2 (269.0)
Cash flow hedge reserve   97.0 235.0 (181.4)
Total   97.0 235.0 (181.4)
Changes in fair value recognized in OCI     (425.2) 269.0
Reclassified from hedging reserve to profit or loss     8.8 0.6
Cash Flow Hedges | Fuel and oil operating expenses | Commodity risk        
Disclosure of detailed information about hedges [line items]        
Net derivative position at year end   (1,228.3) (185.3) 209.8
Change in value used for calculating hedge ineffectiveness   271.9 (688.0) 17.0
Cash flow hedge reserve   (711.8) (185.3) 209.8
Total   (711.8) (185.3) 209.8
Changes in fair value recognized in OCI       (17.0)
Reclassified from hedging reserve to profit or loss       (134.6)
Cash Flow Hedges | Foreign currency forward contracts | Foreign currency risk        
Disclosure of detailed information about hedges [line items]        
Change in value used for calculating hedge ineffectiveness   40.0    
Cash Flow Hedges | Variable-rate instruments | Interest rate risk        
Disclosure of detailed information about hedges [line items]        
Net derivative position at year end   8.0 4.0 (6.7)
Change in value used for calculating hedge ineffectiveness   (3.8) (10.1) (17.2)
Cash flow hedge reserve   (2.8) (17.4) (23.9)
Total   € (2.8) (17.4) (23.9)
Changes in fair value recognized in OCI     (10.1) 17.2
Reclassified from hedging reserve to profit or loss     (0.6) € (2.6)
Cash Flow Hedges | Variable-rate instruments | Commodity risk        
Disclosure of detailed information about hedges [line items]        
Changes in fair value recognized in OCI     688.0  
Reclassified from hedging reserve to profit or loss     € (293.0)