The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Financial instruments - Fair values and risk management - Currency risk (Details) € in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2023 EUR (€)	Mar. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 EUR (€)	Mar. 31, 2023 GBP (£)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 $ / €	Mar. 31, 2023 £ / €	Mar. 31, 2022 GBP (£)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 $ / €	Mar. 31, 2022 £ / €	Mar. 31, 2021 GBP (£)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 $ / €	Mar. 31, 2021 £ / €
Disclosure of detailed information about financial instruments [line items]
Proceeds from issue of notes		€ 1,200.0
Exchange rate							1.0839	0.8791			1.1065	0.8422			1.1728	0.8510
Promissory notes maturing October 2023
Disclosure of detailed information about financial instruments [line items]
Proceeds from issue of notes		230.0	$ 250.0
Foreign currency risk \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on hedge ineffectiveness	€ 0.0	0.0		€ 8.0
Monetary liabilities \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	876.5	549.0		1,224.5
Monetary liabilities \| USD \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure \| $						$ 950.0				$ 607.5				$ 613.0
Monetary liabilities \| GBP \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure \| £													£ 597.3
Long-term borrowings [member] \| USD \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	259.1	281.3		81.6		280.8				311.3				95.7
Long-term borrowings [member] \| GBP \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure				701.8									597.3
Pre-delivery payments due to aircraft manufacturer, Boeing \| USD \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	617.4	267.7		441.1		669.2				296.2				517.3
Cash and liquid resources \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	708.1	383.2		441.5
Cash and liquid resources \| USD \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	619.3	349.6		432.0		$ 671.3				$ 386.8				$ 506.7
Cash and liquid resources \| GBP \| Foreign currency risk
Disclosure of detailed information about financial instruments [line items]
Risk exposure	€ 88.8	€ 33.6		€ 9.5	£ 78.1				£ 28.3				£ 8.1