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Intangible assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Intangible assets      
Beginning Balance € 146.4 € 46.8  
Ending Balance 146.4 146.4 € 46.8
Landing rights      
Intangible assets      
Beginning Balance 146.4 46.8 46.8
Acquisition through business combinations 99.6
Ending Balance 146.4 € 146.4 € 46.8
Impairment of intangible assets € 0.0    
Discounted cash-flow projections period 20 years    
Estimated discount rate applicable 9.00% 6.00% 6.00%