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Deferred and current taxation - Principal components of net deferred tax (Details) - EUR (€) € in Millions	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)	€ 152.7	€ 224.2	€ 258.4	€ 299.9
Temporary differences on designated hedging instruments [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)	(27.6)	149.8	4.8
Property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)	313.8	261.7	411.3
Net operating losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)	€ (133.5)	(180.2)	(139.6)
IFRS 15 transition adjustments
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)		€ (7.1)	(14.2)
Other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability (asset)			€ (3.9)