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Financial instruments - Fair values and risk management - Maturity profile (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2021
Mar. 31, 2022
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 6,856.1 € 6,915.6 € 7,147.2
Cash Flow Hedges      
Disclosure of financial instruments by type of interest rate [line items]      
Gain (loss) on hedge ineffectiveness recognised in profit or loss   € (171.8)  
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% 2.47% 2.43%
Financial liabilities € 28.5 € 187.5 € 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 63.5 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 61.4 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   51.3 € 12.0
Secured 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   € 11.3  
Secured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate   0.70% 0.14%
Financial liabilities   € 65.7 € 20.7
Secured debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   45.0 € 20.7
Secured 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   € 20.7  
Unsecured debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.39% 1.46% 1.31%
Financial liabilities € 3,131.4 € 4,240.5 € 4,041.3
Unsecured debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,040.5 1,617.4 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 46.0 916.2 807.7
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 846.1 808.9 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 49.0 847.0
Unsecured debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   849.0 € 1,197.9
Unsecured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 3.45%   0.75%
Financial liabilities € 750.0 750.0 € 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 | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 750.0  
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 | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.39% 1.50% 1.35%
Financial liabilities € 3,159.9 € 4,428.0 € 4,168.4
Debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,056.7 1,680.9 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 58.3 977.6 859.9
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 846.1 860.2 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 60.3 847.0
Debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   849.0 1,197.9
Lease liabilities - right of use      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 206.3 € 183.1 € 138.3
Lease liabilities - right of use | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 4.37% 2.39% 2.33%
Financial liabilities € 206.3 € 183.1 € 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 43.2 52.5 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 38.4 53.8 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 31.8 48.1 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 32.2 24.8 3.1
Lease liabilities - right of use | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 60.7 3.9 1.1
Total fixed rate debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 3,366.2 4,611.1 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 1,099.9 1,733.4 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 96.7 1,031.4 910.9
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 877.9 908.3 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 1,231.0 85.1 850.1
Total fixed rate debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 60.7 € 852.9 € 1,199.0
Total floating rate debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 3.45% 0.70% 0.73%
Financial liabilities € 750.0 € 815.7 € 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   45.0 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 20.7  
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 | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   750.0  
Total financial liabilities      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 4,116.2 5,426.8 5,077.4
Total financial liabilities | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,099.9 1,778.4 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 846.7 1,052.1 910.9
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 877.9 908.3 836.0
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 1,231.0 835.1 850.1
Total financial liabilities | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 60.7 € 852.9 € 1,199.0