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Issued share capital, share premium account and share options (Details) - EUR (€)
€ / shares in Units, € in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of classes of share capital [line items]      
Authorized capital € 11.2 € 10.7 € 10.7
Issued capital 6.5 6.8 7.0
Ordinary shares      
Disclosure of classes of share capital [line items]      
Authorized capital € 9.8 € 9.3 € 9.3
Number of shares authorized 1,550,000,000 1,550,000,000 1,550,000,000
Authorized/Share Capital reorganization, ordinary shares      
Disclosure of classes of share capital [line items]      
Par value € 0.00600 € 0.00600 € 0.00600
Allotted, called-up and fully paid, ordinary shares      
Disclosure of classes of share capital [line items]      
Number of shares authorized   1,133,395,322  
Par value € 0.00600 € 0.600 € 0.00600
Issue of ordinary equity shares 1,089,181,737 1,089,181,737 1,171,142,985
Issued capital € 6.5 € 6.8 € 7.0
Class B share      
Disclosure of classes of share capital [line items]      
Authorized capital € 0.7 € 0.7 € 0.7
Number of shares authorized 1,368,000,000 1,368,000,000 1,368,000,000
Par value € 0.00050 € 0.00050 € 0.00050
Deferred Share      
Disclosure of classes of share capital [line items]      
Authorized capital € 0.7 € 0.7 € 0.7
Number of shares authorized 1,368,000,000 1,368,000,000 1,368,000,000
Par value € 0.00050 € 0.00050 € 0.00050