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Financial instruments and financial risk management - Financial assets (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of financial assets [line items]      
Total financial assets € 4,549.5 € 3,791.4 € 3,952.7
Total Fair Value 671.7 536.2 214.7
Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     3,738.0
Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 3,877.8 3,255.2  
Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 671.7 536.2 214.7
Cash and cash equivalents      
Disclosure of financial assets [line items]      
Total financial assets 2,566.4 1,675.6 1,515.0
Cash and cash equivalents | Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     1,515.0
Cash and cash equivalents | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 2,566.4 1,675.6  
Cash > 3 months      
Disclosure of financial assets [line items]      
Total financial assets 1,207.2 1,484.4 2,130.5
Cash > 3 months | Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     2,130.5
Cash > 3 months | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 1,207.2 1,484.4  
Restricted cash      
Disclosure of financial assets [line items]      
Total financial assets 34.4 34.9 34.6
Restricted cash | Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     34.6
Restricted cash | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 34.4 34.9  
Foreign currency forward contracts      
Disclosure of financial assets [line items]      
Total financial assets 663.7 527.7 4.6
Total Fair Value 663.7 527.7 4.6
Foreign currency forward contracts | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 663.7 527.7 4.6
Currency swap contract [member]      
Disclosure of financial assets [line items]      
Total financial assets 8.0    
Total Fair Value 8.0    
Currency swap contract [member] | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 8.0    
Interest rate swaps      
Disclosure of financial assets [line items]      
Total financial assets   4.0 0.3
Total Fair Value   4.0 0.3
Interest rate swaps | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets   4.0 0.3
Commodity forward contracts      
Disclosure of financial assets [line items]      
Total financial assets   4.5 209.8
Total Fair Value   4.5 209.8
Commodity forward contracts | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets   4.5 209.8
Trade receivables      
Disclosure of financial assets [line items]      
Total financial assets 67.5 59.5 57.6
Trade receivables | Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     57.6
Trade receivables | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 67.5 59.5  
Other assets      
Disclosure of financial assets [line items]      
Total financial assets 2.3 0.8 0.3
Other assets | Loans and Receivables      
Disclosure of financial assets [line items]      
Total financial assets     € 0.3
Other assets | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets € 2.3 € 0.8