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Analysis of operating revenues and segmental analysis - Geographical information (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations € 13,948.5 € 13,443.8 € 10,775.2
ITALY      
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations 2,969.4 2,853.3 2,364.5
SPAIN      
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations 2,476.5 2,416.2 1,883.4
UNITED KINGDOM      
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations 2,044.6 2,031.0 1,589.7
IRELAND      
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations 757.4 791.0 640.4
Other      
Disclosure of geographical areas [line items]      
Total operating revenues - continuing operations € 5,700.6 € 5,352.3 € 4,297.2