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Financial instruments - Fair values and risk management - Maturity profile (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 7,147.2 € 6,915.6 € 8,363.0
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) € (407.2)
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% 2.47% 2.48%
Financial liabilities € 127.1 € 187.5 € 256.5
Secured debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 62.9 63.5 63.8
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 52.2 61.4 65.4
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 51.3 63.0
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 52.2
Secured debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 12.1
Secured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.14% 0.70% 0.58%
Financial liabilities € 20.7 € 65.7 € 171.6
Secured debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 20.7 45.0 105.9
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 45.0
Secured 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     € 20.7
Unsecured debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.31% 1.46% 1.32%
Financial liabilities € 4,041.3 € 4,240.5 € 2,608.6
Unsecured debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,140.9 1,617.4 34.0
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 807.7 916.2 876.9
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 47.8 808.9 877.5
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 847.0 49.0 770.2
Unsecured debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,197.9 849.0 50.0
Unsecured debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.75%    
Financial liabilities € 750.0 750.0 750.0
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  
Unsecured debt | Floating rate | Thereafter      
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 € 226.0    
Debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.35% 1.50% 1.42%
Financial liabilities € 4,168.4 € 4,428.0 € 2,865.1
Debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,203.8 1,680.9 97.8
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 859.9 977.6 942.3
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 59.8 860.2 940.5
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 847.0 60.3 822.4
Debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,197.9 849.0 € 62.1
Finance leases | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate     2.51%
Financial liabilities     € 116.0
Finance leases | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 116.0
Finance leases | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate     1.19%
Financial liabilities     € 62.6
Finance leases | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     62.6
Lease liabilities - right of use      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 138.3 € 183.1 € 245.9
Lease liabilities - right of use | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 2.33% 2.39% 2.47%
Financial liabilities € 138.3 € 183.1 € 245.9
Lease liabilities - right of use | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 56.9 52.5 75.0
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 51.0 53.8 51.6
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 26.2 48.1 52.1
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 3.1 24.8 46.0
Lease liabilities - right of use | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1.1 3.9 21.2
Total fixed rate debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 4,306.7 4,611.1 3,227.0
Total fixed rate debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,260.7 1,733.4 288.8
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 910.9 1,031.4 993.9
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 86.0 908.3 992.6
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 850.1 85.1 868.4
Total fixed rate debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,199.0 € 852.9 € 83.3
Total floating rate debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.73% 0.70% 0.62%
Financial liabilities € 770.7 € 815.7 € 984.2
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 45.0 168.5
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   20.7 45.0
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   20.7
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 floating rate debt | Floating rate | Thereafter      
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 5,077.4 5,426.8 4,211.2
Total financial liabilities | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,281.4 1,778.4 457.3
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 910.9 1,052.1 1,038.9
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 836.0 908.3 1,013.3
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 850.1 835.1 868.4
Total financial liabilities | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,199.0 € 852.9 € 833.3