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Financial instruments and financial risk management - Maturity profile (Details) - EUR (€)
€ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.73% 0.01% 0.01%
Financial liabilities € 8,363.0 € 4,736.7 € 5,264.1
Financial assets € (4,549.5) € (3,791.4) € (3,952.7)
Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.42% 1.48% 1.54%
Financial liabilities € 2,981.1 € 3,085.6 € 3,170.8
Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   107.0 189.4
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   213.3 95.5
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   941.8 201.3
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   940.0 930.4
Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities   € 883.5 € 1,754.2
Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.62% 0.83% 0.90%
Financial liabilities € 984.2 € 558.8 € 792.2
Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 168.5 202.5 245.2
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 45.0 224.5 200.5
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 20.7 105.8 222.3
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   € 26.0 103.5
Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 750.0   € 20.7
Secured long term debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 2.48% 2.52% 2.56%
Financial liabilities € 256.5 € 330.3 € 350.4
Secured long term debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 63.8 75.8 84.8
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 65.4 63.3 59.9
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 63.0 64.9 46.9
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 52.2 62.5 48.1
Secured long term debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 12.1 € 63.8 110.7
Secured long term debt | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     719.7
Secured long term debt | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     196.4
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     193.4
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     174.6
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     118.8
Secured long term debt | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 36.5
Unsecured long term debt | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.32% 1.30% 1.33%
Financial liabilities € 2,608.6 € 2,642.1 € 2,566.7
Unsecured long term debt | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 34.0 34.0 24.0
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 876.9 34.0 24.0
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 877.5 876.9 24.0
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 770.2 877.5 867.0
Unsecured long term debt | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 50.0 € 819.7 1,627.7
Debt swapped from floating to fixed      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     € 74.4
Debt swapped from floating to fixed | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate     0.37%
Financial liabilities     € 74.4
Debt swapped from floating to fixed | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     14.0
Debt swapped from floating to fixed | 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     14.4
Debt swapped from floating to fixed | 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     14.9
Debt swapped from floating to fixed | 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     15.3
Debt swapped from floating to fixed | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities     15.8
Debt swapped from floating to fixed | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     (74.4)
Debt swapped from floating to fixed | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     (14.0)
Debt swapped from floating to fixed | Floating rate | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     (14.4)
Debt swapped from floating to fixed | Floating rate | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     (14.9)
Debt swapped from floating to fixed | Floating rate | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     (15.3)
Debt swapped from floating to fixed | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial assets     € (15.8)
Long term debt after swaps | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.42% 1.44% 1.45%
Financial liabilities € 2,865.1 € 2,972.4 € 2,991.5
Long term debt after swaps | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 97.8 109.8 122.8
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 942.3 97.3 98.3
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 940.5 941.8 85.8
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 822.4 940.0 930.4
Long term debt after swaps | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 62.1 € 883.5 € 1,754.2
Long term debt after swaps | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 0.58% 0.75% 0.85%
Financial liabilities € 921.6 € 474.8 € 645.3
Long term debt after swaps | Floating rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 105.9 181.1 182.4
Long term debt after swaps | 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 45.0 161.9 179.0
Long term debt after swaps | 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 20.7 105.8 159.7
Long term debt after swaps | 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   € 26.0 103.5
Long term debt after swaps | Floating rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 750.0   € 20.7
Finance leases | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 2.51% 2.54% 2.97%
Financial liabilities € 116.0 € 113.2 € 179.3
Finance leases | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 116.0   66.6
Financial assets   (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  
Financial assets     (2.8)
Finance leases | 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     € 115.5
Finance leases | Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 1.19% 1.27% 1.14%
Financial liabilities € 62.6 € 84.0 € 146.9
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 62.8
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 21.5
Finance leases | 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     62.6
Finance leases      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 245.9    
Finance leases | Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Weighted average rate 2.47%    
Financial liabilities € 245.9    
Finance leases | Fixed rate | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 75.0    
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 51.6    
Finance leases | 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 52.1    
Finance leases | 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 46.0    
Finance leases | Fixed rate | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 21.2    
Current and non-current maturities of debt [Member]      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 4,211.2 3,644.4 3,963.0
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 457.3 309.5 434.6
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 1,038.9 437.8 296.0
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 1,013.3 1,047.6 423.6
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 868.4 966.0 1,033.9
Current and non-current maturities of debt [Member] | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 833.3 € 883.5 € 1,774.9
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 3,227.0    
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets | Less than one year      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 288.8    
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets | Later than one year and not later than two years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 993.9    
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets | Later than two years and not later than three years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 992.6    
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets | Later than three years and not later than four years      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities 868.4    
Fixed Rate Debt Including Lease Liabilities Right Of Use Assets | Thereafter      
Disclosure of financial instruments by type of interest rate [line items]      
Financial liabilities € 83.3