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Financial instruments - Fair values and risk management - Liquidity and capital management (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 3,986.5 € 4,119.6 € 4,675.0
Net cash inflow (outflow) in relation to property, plant and equipment (1,600.0) (2,400.0) (1,800.0)
Repayment of borrowings 50.0 1,100.5 1,039.4
Share buybacks 1,481.7    
Cash and liquid resources      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 4,000.0 € 4,200.0 € 4,700.0