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Financial instruments - Fair values and risk management - Currency risk (Details)
€ in Millions, £ in Millions, $ in Millions
Mar. 31, 2021
GBP (£)
$ / €
Mar. 31, 2021
USD ($)
$ / €
Mar. 31, 2021
EUR (€)
$ / €
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Disclosure of detailed information about financial instruments [line items]                  
Year end foreign currency rate 1.1725 1.1725 1.1725            
Monetary assets £ 8.1 $ 506.7 € 441.5 £ 22.5 $ 2,150.1 € 1,974.8 £ 17.0 $ 485.2 € 452.1
Monetary liabilities £ 597.3 $ 613.0 € 1,224.5   $ 1,181.0 € 1,074.7   $ 202.4 € 180.5
USD                  
Disclosure of detailed information about financial instruments [line items]                  
Year end foreign currency rate 1.1728 1.1728 1.1728 1.1029 1.1029 1.1029 1.1217 1.1217 1.1217
GBP                  
Disclosure of detailed information about financial instruments [line items]                  
Year end foreign currency rate 0.8510 0.8510 0.8510 0.8883 0.8883 0.8883 0.8606 0.8606 0.8606
Current and non-current maturities of debt | USD                  
Disclosure of detailed information about financial instruments [line items]                  
Monetary liabilities   $ 95.7 € 81.6   $ 129.2 € 117.1   $ 202.4 € 180.5
CCFF Facility                  
Disclosure of detailed information about financial instruments [line items]                  
Monetary liabilities £ 597.3   701.8            
Pre-delivery payments due to aircraft manufacturer, Boeing                  
Disclosure of detailed information about financial instruments [line items]                  
Monetary liabilities   517.3 441.1   1,051.8 957.6      
Cash and liquid resources | USD                  
Disclosure of detailed information about financial instruments [line items]                  
Monetary assets   $ 506.7 432.0   $ 2,150.1 1,949.5   $ 485.2 432.5
Cash and liquid resources | GBP                  
Disclosure of detailed information about financial instruments [line items]                  
Monetary assets £ 8.1   € 9.5 £ 22.5   € 25.3 £ 17.0   € 19.6