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Financial instruments - Fair values and risk management - Interest rate re-pricing (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
Cash and cash equivalents      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 3,863.3 3,875.4 3,599.3
Cash > 3 months      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 100.1 237.8 1,056.2
Restricted cash      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 23.1 € 6.4 € 19.5
Cash and liquid resources      
Disclosure of detailed information about financial instruments [line items]      
Weighted average interest rate on financial assets 2.90% 4.20% 3.02%
Current financial assets € 4,000.0 € 4,200.0 € 4,700.0