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Income taxes - Composition of Deferred Tax Assets and Liabilities Reconciled in Consolidated Balance Sheets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:      
Capitalized R&D costs € 311.3 € 481.7 € 514.1
Goodwill 85.1 79.8 65.0
R&D and other tax credit carry forwards 312.1 266.6 217.8
Inventories 70.0 95.5 61.4
Contract liabilities 972.4 1,046.0 959.8
Accrued and other liabilities 113.2 135.4 139.5
Operating loss carry forwards 51.1 1.1 3.9
Property, plant and equipment 13.9 11.4 29.2
Lease liabilities 18.9 25.4 28.7
Other intangible assets 84.7 107.0 119.3
Share-based payments 32.8 30.0 16.8
Other temporary differences 77.3 24.4 22.5
Total deferred tax assets, gross 2,142.8 2,304.3 2,178.0
Valuation allowance (267.7) (242.6) (206.7)
Total deferred tax assets, net 1,875.1 2,061.7 1,971.3
R&D & other credit carry forwards, other (9.7) (9.7)  
Total deferred tax assets, gross (9.7) (9.7)  
Total deferred tax assets, net, other (9.7) (9.7)  
Deferred tax assets, capitalized R&D expenditures, Consolidated Statements of Operations (106.5) (66.5)  
Deferred tax assets, tax credit carryforwards, goodwill, impact on Consolidated Statements of Operations 5.3 14.8  
Deferred tax assets, R&D & other credits, Consolidated Statements of Operations 85.4 45.4  
Deferred tax assets, inventories, Consolidated Statements of Operations (23.4) 31.6  
Deferred tax assets, contract liabilities, Consolidated Statements of Operations 16.8 39.9  
Deferred tax assets, accrued and other liabilities, Consolidated Statements of Operations (9.0) (6.6)  
Deferred tax assets, tax effect carry-forward losses, Consolidated Statements of Operations 49.0 (2.8)  
Deferred tax assets, Property, plant and equipment, Consolidated Statements of Operations 2.7 (16.2)  
Deferred tax assets, lease liabilities, Consolidated Statements of Operations (3.4) (5.0)  
Deferred tax assets, intangible fixed assets, Consolidated Statements of Operations (15.3) (12.3)  
Deferred tax assets, share-based payments, Consolidated Statements of Operations 6.3 6.9  
Deferred tax assets, other temporary differences, Consolidated Statements of Operations 32.7 4.9  
Total deferred tax assets, gross, Consolidated Statements of Operations 40.6 34.1  
Deferred tax assets, valuation allowance, Consolidated Statements of Operations (52.4) (24.9)  
Total deferred tax assets, net, Consolidated Statements of Operations (11.8) 9.2  
Deferred tax assets, other temporary differences, income tax recognized in other comprehensive income   3.7  
Total deferred tax assets, gross, income tax recognized in other comprehensive income   3.7  
Total deferred tax assets, net, income tax recognized in other comprehensive income   3.7  
Capitalized R&D expenditures, effect of changes in exchange rates (63.9) 34.1  
R&D & other credits, effect of changes in exchange rates (30.2) 13.1  
Inventories, effect of changes in exchange rates (2.1) 2.5  
Contract liabilities, effect of changes in exchange rates (90.4) 46.3  
Accrued and other liabilities, effect of changes in exchange rates (13.2) 2.5  
Operating loss carry forwards, effect of changes in exchange rates 1.0    
Property, plant and equipment, effect of changes in exchange rates (0.2) (1.6)  
Lease liabilities, effect of changes in exchange rates (3.1) 1.7  
Other intangible assets, effect of changes in exchange rates (7.0)    
Share-based payments, effect of changes in exchange rates (3.5) 6.3  
Other temporary differences, effect of changes in exchange rates 20.2 (6.7)  
Total deferred tax assets, gross, effect of changes in exchange rates (192.4) 98.2  
Valuation allowance, effect of changes in exchange rates 27.3 (11.0)  
Total deferred tax assets, net, effect of changes in exchange rates (165.1) 87.2  
Deferred tax liabilities:      
Other intangible assets (23.0) (46.0) (52.0)
Goodwill (53.7) (45.7) (38.5)
Inventories 0.0 0.0 (3.8)
Right-of-use assets (18.9) (25.4) (28.7)
Property, plant and equipment (25.0) (36.1) (13.6)
Accrued and other liabilities (27.1) (0.3) (0.5)
Contract liabilities 0.0 0.0 (80.0)
Long-term debt (0.1) (1.3) (1.6)
Other temporary differences (16.4) (12.3) (2.9)
Total deferred tax liabilities (164.2) (167.1) (221.6)
Total deferred tax liabilities, Other 0.0 0.0  
Net deferred tax assets (liabilities), other (9.7) (9.7)  
Deferred tax liabilities, intangible assets, impact on Consolidated Statements of Operations 11.1 9.4  
Deferred tax liabilities, goodwill, impact on Consolidated Statements of Operations (8.0) (7.2)  
Deferred tax liabilities, inventories, impact on Consolidated Statements of Operations   3.7  
Deferred tax liabilities, leasing arrangements, impact on Consolidated Statements of Operations 3.4 5.0  
Deferred tax liabilities, property, plant and equipment, impact on Consolidated Statements of Operations 8.0 (22.7)  
Deferred tax liabilities, accrued and other liabilities, impact on Consolidated Statements of Operations (27.4) 0.2  
Deferred tax liabilities, tax deferred income, impact on Consolidated Statements of Operations   80.0  
Deferred tax liabilities, deferred expense, capitalized interest, impact on Consolidated Statements of Operations 1.2 0.3  
Deferred tax liabilities, other, impact on Consolidated Statements of Operations 7.2 (11.7)  
Total deferred tax liabilities, Consolidated Statements of Operations (4.5) 57.0  
Net deferred tax assets (liabilities), Consolidated Statements of Operations (16.3) 66.2  
Deferred Tax Liabilities, Gross, Income Tax Recognized in Shareholders' Equity   0.0  
Net deferred tax assets (liabilities), Income tax recognized in shareholders' equity   3.7  
Deferred tax liabilities, intangible assets, effect of changes in exchange rates 11.9 (3.4)  
Deferred tax liabilities, inventories, effect of changes in exchange rates   0.1  
Deferred tax liabilities, leasing arrangements, effect of changes in exchange rates 3.1 (1.7)  
Deferred tax liabilities, property, plant and equipment, effect of changes in exchange rates 3.1 0.2  
Deferred tax liabilities, accrued and other liabilities, effect of changes in exchange rates 0.6    
Deferred tax liabilities, other, effect of changes in exchange rates (11.3) 2.3  
Total deferred tax liabilities, effect of changes in exchange rates 7.4 (2.5)  
Net deferred tax assets (liabilities), effect of changes in exchange rates (157.7) 84.7  
Total deferred tax assets, net 1,875.1 2,061.7 1,971.3
Deferred tax liabilities (8.5) (46.1)  
Net deferred tax assets (liabilities) 1,710.9 1,894.6 1,749.7
Deferred tax assets – non-current      
Deferred tax assets:      
Total deferred tax assets, net 1,719.4 1,940.7 1,872.3
Deferred tax liabilities:      
Total deferred tax assets, net 1,719.4 1,940.7 1,872.3
Deferred tax liabilities – non-current      
Deferred tax liabilities:      
Deferred tax liabilities € (8.5) € (46.1) € (122.6)