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Financial instruments - Fair values and risk management - Maturity profile (Details) - EUR (€)
€ in Millions
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate (0.26%) 0.73% 0.01%
Financial liabilities € 6,915.6 € 8,363.0 € 4,736.7
Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.40% 1.42% 1.48%
Financial liabilities € 4,428.0 € 2,981.1 € 3,085.6
Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,733.4 288.8 107.0
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 1,031.4 993.9 213.3
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 908.3 992.6 941.8
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 85.1 868.4 940.0
Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 852.9 83.3 883.5
Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 4,611.1 € 3,227.0 € 3,085.6
Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.70% 0.62% 0.83%
Financial liabilities € 815.7 € 984.2 € 558.8
Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 45.0 168.5 202.5
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 45.0 224.5
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   20.7 105.8
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   26.0
Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   750.0  
Floating rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 815.7 € 984.2 € 558.8
Secured long term debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 2.47% 2.48% 2.52%
Secured long term debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 63.5 € 63.8 € 75.8
Secured long term 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 61.4 65.4 63.3
Secured long term 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 63.0 64.9
Secured long term 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 62.5
Secured long term debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   12.1 63.8
Secured long term debt | Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 187.5 € 256.5 € 330.3
Secured long term debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.70% 0.58% 0.75%
Secured long term debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 45.0 € 105.9 € 181.1
Secured long term 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 45.0 161.9
Secured long term 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   20.7 105.8
Secured long term 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     26.0
Secured long term debt | Floating rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 65.7 € 171.6 € 474.8
Unsecured long term debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.46% 1.32% 1.30%
Unsecured long term debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,617.4 € 34.0 € 34.0
Unsecured long term 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 916.2 876.9 34.0
Unsecured long term 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 808.9 877.5 876.9
Unsecured long term 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 49.0 770.2 877.5
Unsecured long term debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 849.0 50.0 819.7
Unsecured long term debt | Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 4,240.5 2,608.6 € 2,642.1
Unsecured long term 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 long term debt | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   750.0  
Unsecured long term debt | Floating rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 750.0 € 750.0  
Long term debt after swaps | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.50% 1.42% 1.44%
Long term debt after swaps | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 1,680.9 € 97.8 € 109.8
Long term debt after swaps | 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 977.6 942.3 97.3
Long term debt after swaps | 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 860.2 940.5 941.8
Long term debt after swaps | 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 60.3 822.4 940.0
Long term debt after swaps | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 849.0 62.1 883.5
Long term debt after swaps | Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 4,428.0 € 2,865.1 € 2,972.4
Finance leases | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate   2.51% 2.54%
Finance leases | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 116.0 € (2.8)
Finance leases | 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     116.0
Finance leases | Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 116.0 € 113.2
Finance leases | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate   1.19% 1.27%
Finance leases | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 62.6 € 21.4
Finance leases | 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     62.6
Finance leases | Floating rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   62.6 84.0
Lease liabilities - Right of use      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 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 2.39% 2.47%  
Lease liabilities - Right of use | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 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 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 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 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 3.9 21.2  
Lease liabilities - Right of use | Fixed rate | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 183.1 245.9  
Current and non-current maturities of debt [Member]      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 5,426.8 4,211.2 3,644.4
Current and non-current maturities of debt [Member] | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,778.4 457.3 309.5
Current and non-current maturities of debt [Member] | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 1,052.1 1,038.9 437.8
Current and non-current maturities of debt [Member] | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 908.3 1,013.3 1,047.6
Current and non-current maturities of debt [Member] | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 835.1 868.4 966.0
Current and non-current maturities of debt [Member] | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 852.9 833.3 883.5
Current and non-current maturities of debt [Member] | Total      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 5,426.8 € 4,211.2 € 3,644.4