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Accrued expenses and other liabilities - Contract liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Contract Liabilities      
Opening contract liabilities € 2,899.0 € 2,786.5 € 1,554.2
Revenue deferred during the year 13,637.4 12,840.8 11,343.0
Revenue recognized during the year (13,104.2) (12,728.3) (10,110.7)
Closing contract liabilities € 3,432.2 € 2,899.0 € 2,786.5