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Shareholder returns - (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended 24 Months Ended
Feb. 29, 2024
Mar. 31, 2024
Mar. 31, 2023
Shareholder returns      
Shareholder returns   € 199.5  
Dividends paid € 200.0   € 0.0
Dividends paid per share € 0.175    
Recommended final dividend   € 200.0  
Recommended final dividend per share   € 0.178