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Retirement benefits (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Retirement benefits      
Pension cost of defined-contribution plans € 9.0 € 7.9 € 5.2
Net pension liability 3.9 3.9 3.9
Costs associated with the defined benefit plans 0.0 0.0 0.0
The amounts recognized in the consolidated balance sheet in respect of defined benefit plans      
Present value of benefit obligations (14.9) (14.9) (14.9)
Fair value of plan assets 10.4 10.4 10.4
Present value of net obligations (4.5) (4.5) (4.5)
Related deferred tax asset 0.6 0.6 0.6
Net pension liability € (3.9) € (3.9) € (3.9)