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Deferred and current taxation - Deferred tax movement (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]      
Deferred tax expense (income) recognised in profit or loss € 47.4 € 161.5 € 106.0
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss 23.6 53.4 52.2
IFRS 15 transition adjustments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss     7.1
Net operating losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss € 23.8 108.0 € 46.7
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss   € 0.1