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Staff numbers and costs - Government grants and assistance (Details)
€ in Millions, £ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2021
GBP (£)
Mar. 31, 2021
Apr. 30, 2020
GBP (£)
Mar. 31, 2023
EUR (€)
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Payroll supports received amount       € 0.0 € 82.0 € 84.0
Proceeds from borrowings         1,192.0 [1] 2,228.6
Repayment of borrowings       € 1,039.4 € 1,722.3 € 950.3
HMT and Bank of England Covid Corporate Financing Facility (CCFF) [Member]            
Disclosure of detailed information about borrowings [line items]            
Proceeds from borrowings | £     £ 600      
Debt Extension Term   12 months        
Interest rate percentage   0.46% 0.44%     0.46%
Repayment of borrowings | £ £ 600          
[1] €1.2bn bond net of transaction costs.