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Accrued expenses and other liabilities - Contract liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Contract Liabilities      
Opening contract liabilities € 546.5 € 1,962.3 € 1,408.3
IFRS 15 transition adjustment     287.0
Revenue deferred during the year 1,248.0 6,107.2 6,914.9
Revenue recognized during the year (1,503.6) (7,523.0) (6,647.9)
Closing contract liabilities € 290.9 € 546.5 € 1,962.3