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Deferred and current taxation - Items charged or credited to other comprehensive income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax charge (credit) in other comprehensive income € 144.5 € 57.6 € (94.7)
Effective portion of changes in fair value of cash-flow hedges      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax charge (credit) in other comprehensive income 117.7 124.5 (9.4)
Net change in fair value of cash-flow hedges transferred to property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax charge (credit) in other comprehensive income 2.7 0.2  
Net hedge ineffectiveness and discontinuation transferred to profit or loss      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax charge (credit) in other comprehensive income   (24.4) (53.5)
Net other changes in fair value of cash-flow hedges transferred to profit or loss      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax charge (credit) in other comprehensive income € 24.1 € (42.7) € (31.8)