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Financial instruments and financial risk management - Financial liabilities (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of financial liabilities [line items]      
Total financial liabilities € 8,117.1 € 4,736.7 € 5,264.1
Total Fair Value 4,726.3 3,923.0 4,667.0
Liabilities at Amortized Cost      
Disclosure of financial liabilities [line items]      
Total financial liabilities 6,886.6 4,539.0 4,658.1
Cash-Flow Hedges      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,230.5 197.7 606.0
Current and non-current maturities of debt      
Disclosure of financial liabilities [line items]      
Total financial liabilities 3,965.3 3,644.4 3,963.0
Total Fair Value 3,495.8 3,725.3 4,061.0
Current and non-current maturities of debt | Liabilities at Amortized Cost      
Disclosure of financial liabilities [line items]      
Total financial liabilities 3,965.3 3,644.4 3,963.0
Foreign currency forward contracts      
Disclosure of financial liabilities [line items]      
Total financial liabilities 2.2 8.0 599.0
Total Fair Value 2.2 8.0 599.0
Foreign currency forward contracts | Cash-Flow Hedges      
Disclosure of financial liabilities [line items]      
Total financial liabilities 2.2 8.0 599.0
Commodity forward contracts      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,228.3 189.7  
Total Fair Value 1,228.3 189.7  
Commodity forward contracts | Cash-Flow Hedges      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,228.3 189.7  
Commodity forward contracts | Not Designated As Hedging Instruments      
Disclosure of financial liabilities [line items]      
Total financial liabilities 516.5    
Interest rate swaps      
Disclosure of financial liabilities [line items]      
Total financial liabilities     7.0
Total Fair Value     7.0
Interest rate swaps | Cash-Flow Hedges      
Disclosure of financial liabilities [line items]      
Total financial liabilities     7.0
Trade payables      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,368.2 573.8 249.6
Trade payables | Liabilities at Amortized Cost      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,368.2 573.8 249.6
Accrued expenses      
Disclosure of financial liabilities [line items]      
Total financial liabilities 1,553.1 320.8 445.5
Accrued expenses | Liabilities at Amortized Cost      
Disclosure of financial liabilities [line items]      
Total financial liabilities € 1,553.1 € 320.8 € 445.5