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Deferred and current taxation - Schedule of reconciliation of deferred tax assets and liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Reconciliation of deferred tax      
Liability at beginning of year € 417.4 € 395.2 € 473.1
Deferred tax expense (income) recognised in profit or loss 23.0    
Income tax relating to components of other comprehensive income (94.7) 91.2 (87.0)
Liability at end of year 299.9 417.4 395.2
Deferred tax assets 53.6 43.2  
Deferred tax liabilities (353.5) (460.6) (395.2)
Property, plant and equipment      
Reconciliation of deferred tax      
Deferred tax expense (income) recognised in profit or loss   69.0 9.0
IFRS 15      
Reconciliation of deferred tax      
Deferred tax expense (income) recognised in profit or loss   36.0  
Derivatives      
Reconciliation of deferred tax      
Liability at beginning of year 42.3 (48.9)  
Income tax relating to components of other comprehensive income 95.0 (91.0)  
Liability at end of year (52.4) 42.3 (48.9)
Pensions      
Reconciliation of deferred tax      
Liability at beginning of year (0.6) (0.6)  
Liability at end of year € (0.6) € (0.6) € (0.6)