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Deferred and current taxation - Principal components of net deferred tax (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax liability (asset) € 375.5 € 359.9 € 152.7 € 224.2
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) (11.8) 18.2 (27.6)  
Property, plant and equipment        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax liability (asset) 388.9 367.1 313.8  
Net operating losses        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax liability (asset) € (1.6) € (25.4) € (133.5)