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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, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total tax (credit)/charge in other comprehensive income € (31.8) € 45.7 € (177.5)
Effective portion of changes in fair value of cash-flow hedges      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Total tax (credit)/charge in other comprehensive income (22.3) 48.7 66.6
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]      
Total tax (credit)/charge in other comprehensive income (3.4) (11.8) (16.4)
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]      
Total tax (credit)/charge in other comprehensive income € (6.1) € 8.8 € (227.7)