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Financial instruments - Fair values and risk management - Liquidity and capital management (Details)
€ in Millions, £ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2023
EUR (€)
Oct. 31, 2021
GBP (£)
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Apr. 30, 2020
Disclosure of detailed information about financial instruments [line items]            
Net cash inflow (outflow) in relation to property, plant and equipment     € (1,782.0) € (957.0) € 195.0  
Cash generated from debt capital market issuances       1,200.0    
Repayment of borrowings     € 1,039.4 1,722.3 € 950.3  
HMT and Bank of England Covid Corporate Financing Facility (CCFF)            
Disclosure of detailed information about financial instruments [line items]            
Repayment of borrowings | £   £ 600        
Borrowings, interest rate         0.46% 0.44%
Unsecured Eurobonds, Euro 850 M            
Disclosure of detailed information about financial instruments [line items]            
Repayment of borrowings € 850.0          
Borrowings, interest rate 1.125%   1.125%      
EXIM debt            
Disclosure of detailed information about financial instruments [line items]            
Repayment of borrowings     € 51.0      
Cash and liquid resources            
Disclosure of detailed information about financial instruments [line items]            
Current financial assets € 4,675.0   € 4,675.0 € 3,626.0 € 3,150.0