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Finance expense (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Finance expense      
Interest expense € 69.8 € 72.9 € 59.1
Hedge discontinuance and ineffectiveness (see note 13) 227.3 407.2  
Finance expense € 297.1 € 480.1 € 59.1