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Financial instruments and financial risk management - Interest rate re-pricing (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Weighted average rate 0.73% 0.01% 0.01%
Current financial assets € 3,808.0 € 3,194.9 € 3,680.1
Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 3,808.0 3,194.9 3,680.1
Minimum      
Disclosure of detailed information about financial instruments [line items]      
Fixed interest rate term 7 years    
Maximum      
Disclosure of detailed information about financial instruments [line items]      
Fixed interest rate term 12 years    
Cash and cash equivalents      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 2,566.4 1,675.6 1,515.0
Cash and cash equivalents | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 2,566.4 1,675.6 1,515.0
Cash > 3 months      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 1,207.2 1,484.4 2,130.5
Cash > 3 months | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 1,207.2 1,484.4 2,130.5
Restricted cash      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets 34.4 34.9 34.6
Restricted cash | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Current financial assets € 34.4 € 34.9 € 34.6