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Shareholder returns - (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Aug. 31, 2024
May 31, 2024
Classes of share capital              
Shareholder returns     € 437.7 € 199.5      
Dividends paid         € 0.0    
Dividends paid per share € 0.223 € 0.175          
Recommended final dividend per share     € 0.227 € 0.178      
May 2024 share buyback program              
Classes of share capital              
Share Repurchase Program, Authorized, Amount             € 700.0
August 2024 share buyback program              
Classes of share capital              
Share Repurchase Program, Authorized, Amount           € 800.0  
Percentage of buyback program completed     98.00%