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Financial instruments and financial risk management - Fair value (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 671.7 € 536.2 € 214.7
Liabilities measured at fair value 4,726.3 3,923.0 4,667.0
Financial assets (liabilities) at fair value 5,398.0 4,459.2 4,881.7
At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 671.7 536.2 214.7
Liabilities measured at fair value 1,230.5 197.7 606.0
Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial assets (liabilities) at fair value 5,398.0 4,459.2 4,881.7
Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 671.7 536.2 214.7
Liabilities measured at fair value 1,230.5 197.7 606.0
Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2.2 8.0 599.0
Foreign currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2.2 8.0 599.0
Foreign currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2.2 8.0 599.0
Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 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 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 1,228.3 189.7  
Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value     7.0
Interest rate swaps | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value     7.0
Interest rate swaps | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value     7.0
Current and non-current maturities of debt      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 3,495.8 3,725.3 4,061.0
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 3,495.8 3,725.3 4,061.0
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 3,495.8 3,725.3 4,061.0
Foreign currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 663.7 527.7 4.6
Foreign currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 663.7 527.7 4.6
Foreign currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 663.7 527.7 4.6
Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   4.5 209.8
Commodity forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   4.5 209.8
Commodity forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   4.5 209.8
Currency swap contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 8.0    
Currency swap contract [member] | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 8.0    
Currency swap contract [member] | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 8.0    
Interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   4.0 0.3
Interest rate swaps | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   4.0 0.3
Interest rate swaps | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value   € 4.0 € 0.3