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Financial instruments - Fair values and risk management - Contractual undiscounted cash flows (Details) - EUR (€)
€ in Millions
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 5,565.4 € 5,324.2 € 6,856.1
Derivative financial instruments (109.8) (352.8) (346.7)
Derivatives and Non derivatives, contractual undiscounted cash flows 5,681.1 5,502.4 7,004.8
Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial instruments (94.4) (349.5) (292.1)
Derivatives and Non derivatives, contractual undiscounted cash flows 3,819.2 2,725.8 3,879.7
Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives and Non derivatives, contractual undiscounted cash flows 1,259.0 936.6 901.1
Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives and Non derivatives, contractual undiscounted cash flows 51.0 1,266.6 917.9
Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives and Non derivatives, contractual undiscounted cash flows 41.0 51.5 1,245.0
Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Derivatives and Non derivatives, contractual undiscounted cash flows 510.9 521.9 61.1
Long and short term debt and lease liabilities      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 2,682.7 2,746.8 4,116.2
Non-derivative financial liabilities, undiscounted cash flows 2,811.9 2,935.0 4,300.1
Long and short term debt and lease liabilities | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 939.1 151.7 1,177.6
Long and short term debt and lease liabilities | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 1,265.4 936.7 894.9
Long and short term debt and lease liabilities | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 54.8 1,266.8 918.0
Long and short term debt and lease liabilities | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 41.3 56.4 1,245.2
Long and short term debt and lease liabilities | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 511.3 523.4 64.4
Long and short term debt | Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 2,044.7 2,092.2 3,159.9
Non-derivative financial liabilities, undiscounted cash flows € 2,092.0 € 2,172.7 € 3,284.4
Long and short term debt | Fixed rate | Average      
Disclosure of detailed information about financial instruments [line items]      
Interest rate percentage 1.70% 1.67% 1.39%
Long and short term debt | Fixed rate | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows € 882.7 € 85.0 € 1,100.6
Long and short term debt | Fixed rate | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 1,209.3 878.3 93.5
Long and short term debt | Fixed rate | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows   1,209.4 881.0
Long and short term debt | Fixed rate | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows     1,209.3
Long and short term debt | Floating rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 488.9 490.0 750.0
Non-derivative financial liabilities, undiscounted cash flows € 556.3 € 579.2 € 782.3
Long and short term debt | Floating rate | Average      
Disclosure of detailed information about financial instruments [line items]      
Interest rate percentage 2.67% 4.30% 3.45%
Long and short term debt | Floating rate | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows € 13.3 € 21.2 € 25.9
Long and short term debt | Floating rate | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 13.4 21.3 756.4
Long and short term debt | Floating rate | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 13.2 21.3  
Long and short term debt | Floating rate | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 13.2 21.5  
Long and short term debt | Floating rate | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 503.2 493.9  
Lease liabilities - right of use      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 149.1 164.6 206.3
Non-derivative financial liabilities, undiscounted cash flows 163.6 183.1 233.4
Lease liabilities - right of use | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 43.1 45.5 51.1
Lease liabilities - right of use | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 42.7 37.1 45.0
Lease liabilities - right of use | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 41.6 36.1 37.0
Lease liabilities - right of use | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 28.1 34.9 35.9
Lease liabilities - right of use | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 8.1 29.5 64.4
Lease liabilities - right of use | Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 149.1 € 164.6 € 206.3
Interest rate percentage 4.89% 4.43% 4.37%
Lease liabilities - right of use | Fixed rate | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 37.4 € 39.4 € 43.2
Lease liabilities - right of use | Fixed rate | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 37.9 31.9 38.4
Lease liabilities - right of use | Fixed rate | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 38.8 32.1 31.8
Lease liabilities - right of use | Fixed rate | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 27.1 32.7 32.2
Lease liabilities - right of use | Fixed rate | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 7.9 28.5 60.7
Foriegn currency forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 2.7 3.3 48.0
Foreign currency forward contract outflows      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 2.7 3.3 48.0
Derivatives, contractual undiscounted cash flows 508.6 188.3 3,658.2
Foreign currency forward contract outflows | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 51.6 7.0 3,281.4
Foreign currency forward contract outflows | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 327.3 10.6 245.1
Foreign currency forward contract outflows | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 116.5 10.0 10.6
Foreign currency forward contract outflows | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 7.0 133.6 10.0
Foreign currency forward contract outflows | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 6.2 27.1 111.1
Foreign currency forward contract inflows      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (519.4) (195.0) (3,645.4)
Foreign currency forward contract inflows | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (51.5) (7.0) (3,263.2)
Foreign currency forward contract inflows | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (333.7) (10.7) (246.9)
Foreign currency forward contract inflows | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (120.3) (10.2) (10.7)
Foreign currency forward contract inflows | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (7.3) (138.5) (10.2)
Foreign currency forward contract inflows | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows (6.6) (28.6) (114.4)
Commodity forward contracts      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 224.5 178.8 349.8
Derivatives, contractual undiscounted cash flows 224.5 178.8 349.8
Commodity forward contracts | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows 224.5 178.8 341.8
Commodity forward contracts | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Derivatives, contractual undiscounted cash flows     8.0
Trade payables      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 702.0 792.2 1,065.5
Non-derivative financial liabilities, undiscounted cash flows 702.0 792.2 1,065.5
Trade payables | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 702.0 792.2 1,065.5
Accrued expenses      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 1,953.5 1,603.1 1,276.6
Non-derivative financial liabilities, undiscounted cash flows 1,953.5 1,603.1 1,276.6
Accrued expenses | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Non-derivative financial liabilities, undiscounted cash flows 1,953.5 1,603.1 1,276.6
Debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 1,685.2 2,532.2 2,853.2
Debt | Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 2,044.7 € 2,092.2 € 3,159.9
Interest rate percentage 1.70% 1.67% 1.39%
Debt | Fixed rate | Less than one year      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 848.4 € 50.0 € 1,056.7
Debt | Fixed rate | Later than one year and not later than two years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities € 1,196.3 843.4 58.3
Debt | Fixed rate | Later than two years and not later than three years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   € 1,198.8 846.1
Debt | Fixed rate | Later than three years and not later than four years      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities     € 1,198.8