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Financial instruments - Fair values and risk management - Maturity profile (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 5,324.2 € 6,856.1 € 7,147.2
Cash Flow Hedges | Cross currency interest rate swap contract      
Disclosure of financial instruments by type of interest rate [line items]      
Gain (loss) on hedge ineffectiveness recognised in profit or loss € 0.0    
Secured debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate   2.43% 2.43%
Financial liabilities   € 28.5 € 127.1
Secured debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   16.2 62.9
Secured debt | Fixed rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 12.3 52.2
Secured debt | Fixed rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 12.0
Secured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate     0.14%
Financial liabilities     € 20.7
Secured debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 20.7
Unsecured debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.67% 1.39% 1.31%
Financial liabilities € 2,092.2 € 3,131.4 € 4,041.3
Unsecured debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 50.0 1,040.5 1,140.9
Unsecured debt | Fixed rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 843.4 46.0 807.7
Unsecured debt | Fixed rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,198.8 846.1 47.8
Unsecured debt | Fixed rate | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 1,198.8 847.0
Unsecured debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 1,197.9
Unsecured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 4.30% 3.45% 0.75%
Financial liabilities € 490.0 € 750.0 € 750.0
Unsecured debt | Floating rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   750.0  
Unsecured debt | Floating rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     750.0
Unsecured debt | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 490.0    
Promissory notes | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   230.0 226.0
Debt      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 2,532.2 € 2,853.2 € 3,714.6
Debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.67% 1.39% 1.35%
Financial liabilities € 2,092.2 € 3,159.9 € 4,168.4
Debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 50.0 1,056.7 1,203.8
Debt | Fixed rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 843.4 58.3 859.9
Debt | Fixed rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,198.8 846.1 59.8
Debt | Fixed rate | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   1,198.8 847.0
Debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     1,197.9
Lease liabilities - right of use      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 164.6 € 206.3 € 138.3
Lease liabilities - right of use | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 4.43% 4.37% 2.33%
Financial liabilities € 164.6 € 206.3 € 138.3
Lease liabilities - right of use | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 39.4 43.2 56.9
Lease liabilities - right of use | Fixed rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 31.9 38.4 51.0
Lease liabilities - right of use | Fixed rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 32.1 31.8 26.2
Lease liabilities - right of use | Fixed rate | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 32.7 32.2 3.1
Lease liabilities - right of use | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 28.5 60.7 1.1
Total fixed rate debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 2,256.8 3,366.2 4,306.7
Total fixed rate debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 89.4 1,099.9 1,260.7
Total fixed rate debt | Fixed rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 875.3 96.7 910.9
Total fixed rate debt | Fixed rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,230.9 877.9 86.0
Total fixed rate debt | Fixed rate | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 32.7 1,231.0 850.1
Total fixed rate debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 28.5 € 60.7 € 1,199.0
Total floating rate debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 4.30% 3.45% 0.73%
Financial liabilities € 490.0 € 750.0 € 770.7
Total floating rate debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     20.7
Total floating rate debt | Floating rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   750.0  
Total floating rate debt | Floating rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     750.0
Total floating rate debt | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 490.0    
Total financial liabilities      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 2,746.8 4,116.2 5,077.4
Total financial liabilities | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 89.4 1,099.9 1,281.4
Total financial liabilities | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 875.3 846.7 910.9
Total financial liabilities | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,230.9 877.9 836.0
Total financial liabilities | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 32.7 1,231.0 850.1
Total financial liabilities | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 518.5 € 60.7 € 1,199.0