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Financial instruments - Fair values and risk management - Fair value (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Financial assets and liabilities for which fair value is disclosed, at fair value      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities at fair value € 2,848.7 € 3,045.2 € 4,536.9
At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 109.8 352.8 346.7
Liabilities measured at fair value 227.2 182.1 397.8
Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2,511.7 2,510.3 3,792.4
Level 2 | Financial assets and liabilities for which fair value is disclosed, at fair value      
Disclosure of detailed information about financial instruments [line items]      
Financial assets and liabilities at fair value 2,848.7 3,045.2 4,536.9
Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 109.8 352.8 346.7
Liabilities measured at fair value 227.2 182.1 397.8
Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2,511.7 2,510.3 3,792.4
Foriegn currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2.7 3.3 48.0
Foriegn currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2.7 3.3 48.0
Jet fuel and carbon derivative contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 224.5 178.8 349.8
Jet fuel and carbon derivative contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 224.5 178.8 349.8
Debt | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2,511.7 2,510.3 3,792.4
Debt | Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2,511.7 2,510.3 3,792.4
Foriegn currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 5,440.5 4,851.5 7,076.6
Foriegn currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 90.2 147.2 279.4
Foriegn currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 90.2 147.2 279.4
Cross-currency swaps | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     3.6
Cross-currency swaps | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     3.6
Jet fuel and carbon derivative contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 19.6 205.6 63.7
Jet fuel and carbon derivative contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 19.6 € 205.6 € 63.7