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Financial instruments - Fair values and risk management - Fair value (Details) - EUR (€)
€ in Millions
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 346.7 € 1,585.5 € 217.3
Liabilities measured at fair value 4,190.2 5,040.0 5,621.9
Financial assets and liabilities for which fair value is disclosed, at fair value      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 4,536.9 6,625.5 5,839.2
At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 346.7 1,585.5 217.3
Liabilities measured at fair value 397.8 38.6 85.6
Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 3,792.4 5,001.4 5,536.3
Level 2 | Financial assets and liabilities for which fair value is disclosed, at fair value      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 4,536.9 6,625.5 5,839.2
Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 346.7 1,585.5 217.3
Liabilities measured at fair value 397.8 38.6 85.6
Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 3,792.4 5,001.4 5,536.3
Foriegn currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 48.0 31.0 65.8
Foriegn currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 48.0 31.0 65.8
Foriegn currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 48.0 31.0 65.8
Jet fuel and carbon      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 349.8 7.6 19.8
Jet fuel and carbon | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 349.8 7.6 19.8
Jet fuel and carbon | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 349.8 7.6 19.8
Debt      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 2,740.7 3,727.7 3,630.5
Debt | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 3,792.4 4,952.2 5,356.4
Debt | Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value 3,792.4 4,952.2 5,356.4
Trade payables (Non-current)      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value   49.2 179.9
Trade payables (Non-current) | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value   49.2 179.9
Trade payables (Non-current) | Level 2 | Not at fair value      
Disclosure of detailed information about financial instruments [line items]      
Liabilities measured at fair value   49.2 179.9
Foriegn currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 279.4 474.1 208.9
Foriegn currency forward contracts | Cash Flow Hedges      
Disclosure of detailed information about financial instruments [line items]      
Notional amount 7,076.6 6,705.5 3,069.3
Foriegn currency forward contracts | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 279.4 474.1 208.9
Foriegn currency forward contracts | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 279.4 474.1 208.9
GBP Currency Swaps      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value     5.4
Jet fuel and carbon      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 49.6 956.3  
Jet fuel and carbon | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 63.7 1,106.8 5.4
Jet fuel and carbon | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 63.7 1,106.8 5.4
Currency swap contract      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 3.6 4.6 3.0
Currency swap contract | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value 3.6 4.6 3.0
Currency swap contract | Level 2 | At fair value      
Disclosure of detailed information about financial instruments [line items]      
Assets measured at fair value € 3.6 € 4.6 € 3.0