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Financial instruments and financial risk management - Commodity risk (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Commodity forward contracts | Commodity risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets (liabilities) € (1,228.3) € (185.2) € 209.8