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Financial instruments - Fair values and risk management - Financial assets (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of financial assets [line items]      
Total financial assets € 4,169.8 € 4,548.8 € 5,081.4
Current derivative assets 94.4 349.5 292.1
Financial instruments for which fair value is disclosed      
Disclosure of financial assets [line items]      
Total Fair Value 109.8 352.8 346.7
Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 4,060.0 4,196.0 4,734.7
Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 109.8 352.8 346.7
Cash and cash equivalents      
Disclosure of financial assets [line items]      
Total financial assets 3,863.3 3,875.4 3,599.3
Cash and cash equivalents | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 3,863.3 3,875.4 3,599.3
Cash > 3 months      
Disclosure of financial assets [line items]      
Total financial assets 100.1 237.8 1,056.2
Cash > 3 months | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 100.1 237.8 1,056.2
Restricted cash      
Disclosure of financial assets [line items]      
Total financial assets 23.1 6.4 19.5
Restricted cash | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets 23.1 6.4 19.5
Foriegn currency forward contracts      
Disclosure of financial assets [line items]      
Total financial assets 90.2 147.2 279.4
Foriegn currency forward contracts | Financial instruments for which fair value is disclosed      
Disclosure of financial assets [line items]      
Total Fair Value 90.2 147.2 279.4
Foriegn currency forward contracts | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 90.2 147.2 279.4
Jet fuel and carbon derivative contracts      
Disclosure of financial assets [line items]      
Total financial assets 19.6 205.6 49.6
Jet fuel and carbon derivative contracts | Financial instruments for which fair value is disclosed      
Disclosure of financial assets [line items]      
Total Fair Value 19.6 205.6 49.6
Jet fuel and carbon derivative contracts | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets 19.6 205.6 49.6
Jet fuel options      
Disclosure of financial assets [line items]      
Total financial assets     14.1
Jet fuel options | Financial instruments for which fair value is disclosed      
Disclosure of financial assets [line items]      
Total Fair Value     14.1
Jet fuel options | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets     14.1
Currency swap contract      
Disclosure of financial assets [line items]      
Total financial assets     3.6
Currency swap contract | Financial instruments for which fair value is disclosed      
Disclosure of financial assets [line items]      
Total Fair Value     3.6
Currency swap contract | Cash-Flow Hedges      
Disclosure of financial assets [line items]      
Total financial assets     3.6
Trade receivables      
Disclosure of financial assets [line items]      
Total financial assets 73.5 76.4 59.7
Trade receivables | Amortized Cost      
Disclosure of financial assets [line items]      
Total financial assets € 73.5 € 76.4 € 59.7