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Financial instruments - Fair values and risk management - Notional principal amounts (Details)
€ in Millions
Mar. 31, 2023
EUR (€)
Mar. 31, 2023
$ / €
Mar. 31, 2023
£ / €
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
$ / €
Mar. 31, 2022
£ / €
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
$ / €
Mar. 31, 2021
£ / €
Disclosure of detailed information about financial instruments [line items]                  
Closing foreign exchange rate   1.0839 0.8791   1.1065 0.8422   1.1728 0.8510
Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Hedged exchange rate | $ / €   1.13              
Foriegn currency forward contracts | Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 7,076.6     € 6,705.5     € 3,069.3    
Forward foreign exchange contracts - Within 1 Year | Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount 5,873.1     4,607.7     1,506.9    
Forward foreign exchange contracts - Greater than 1 Year | Cash Flow Hedges                  
Disclosure of detailed information about financial instruments [line items]                  
Notional amount € 1,203.5     € 2,097.8     € 1,562.4