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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
Oct. 31, 2021
GBP (£)
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
GBP (£)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
Disclosure of detailed information about financial instruments [line items]          
Net cash inflow (outflow) in relation to property, plant and equipment   € 957.0   € 195.0 € (579.0)
Cash generated from debt capital market issuances   1,200.0      
Share buybacks   0.0   0.0 580.5
HMT and Bank of England Covid Corporate Financing Facility (CCFF)          
Disclosure of detailed information about financial instruments [line items]          
Repayment of borrowings | £ £ 600   £ 600    
Cash and liquid resources          
Disclosure of detailed information about financial instruments [line items]          
Current financial assets   € 3,626.0   € 3,150.0 € 3,808.0