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Retirement benefits (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Retirement benefits      
Net pension liability € 3.9 € 4.1 € 4.1
The amounts recognized in the consolidated balance sheet in respect of defined benefit plans      
Present value of benefit obligations (14.9) (15.0) (15.0)
Fair value of plan assets 10.4 10.3 10.3
Present value of net obligations (4.5) (4.7) (4.7)
Related deferred tax asset 0.6 0.6 0.6
Net pension liability (3.9) (4.1) (4.1)
Pension cost of defined-contribution plans € 13.0 € 9.0 € 6.0