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Financial instruments - Fair values and risk management - Fair value (Details) - EUR (€)
€ in Millions
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 217.3 € 671.7 € 536.2
Liabilities measured at fair value 5,621.9 4,726.3 3,923.0
At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 217.3 671.7 536.2
Liabilities measured at fair value 85.6 1,230.5 197.7
Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 5,536.3    
Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 217.3 671.7 536.2
Liabilities measured at fair value 85.6 1,230.5 197.7
Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 5,536.3    
Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 65.8 2.2 8.0
Foreign currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 65.8 2.2 8.0
Foreign currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 65.8 2.2 8.0
Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 19.8 1,228.3 189.7
Commodity forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 19.8 1,228.3 189.7
Commodity forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 19.8 1,228.3 189.7
Current and non-current maturities of debt      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 5,356.4 3,495.8 3,725.3
Current and non-current maturities of debt | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 5,356.4 3,495.8 3,725.3
Current and non-current maturities of debt | Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 5,356.4 3,495.8 3,725.3
Trade payables | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 179.9    
Trade payables | Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 179.9    
Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 208.9 663.7 527.7
Foreign currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 208.9 663.7 527.7
Foreign currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 208.9 663.7 527.7
GBP Currency Swaps      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 5.4    
GBP Currency Swaps | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 5.4    
GBP Currency Swaps | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 5.4    
Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     4.5
Commodity forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     4.5
Commodity forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     4.5
Currency swap contract      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 3.0    
Currency swap contract | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 3.0 8.0 4.0
Currency swap contract | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 3.0 8.0 4.0
Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   € 8.0 € 4.0