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Accrued expenses and other liabilities - Contract liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Contract Liabilities      
Opening contract liabilities € 1,962.3 € 1,408.3 € 1,332.8
IFRS 15 transition adjustment   287.0  
Revenue deferred during the year 6,107.2 6,914.9 6,354.2
Revenue recognized during the year (7,523.0) (6,647.9) (6,278.7)
Closing contract liabilities € 546.5 € 1,962.3 € 1,408.3