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Trade Receivables (Details) - EUR (€)
€ in Millions
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Trade receivables      
Trade receivables € 18.6 € 67.5 € 59.5
Cost      
Trade receivables      
Trade receivables € 18.6 € 67.5 59.6
Allowance for impairment      
Trade receivables      
Trade receivables     € (0.1)