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Financial risk management - Derivative Financial Instruments Per Category (Details)
€ in Millions, ₩ in Billions, ¥ in Billions, ¥ in Billions, $ in Billions, $ in Billions
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JPY (¥)
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
CNY (¥)
Derivative [Line Items]                        
Derivative assets € 33.6           € 96.5          
Derivative financial instruments 93.0           113.6          
Derivative financial instruments 0.0           0.0          
Derivative liabilities, noncurrent 19.9           29.3          
Derivative assets, current 33.6           96.5          
Derivative liabilities, current 73.1           84.3          
Forward foreign exchange contracts                        
Derivative [Line Items]                        
Notional amount 755.8 $ 1.6 ¥ 39.7 $ 18.0 ₩ 144.9 ¥ 1.1 240.6 $ 1.0 ¥ 1.1 $ 27.6 ₩ 66.4 ¥ 1.1
Forward foreign exchange contracts, fair value (11.5)           44.5          
Forward foreign exchange contracts | Cash flow hedges                        
Derivative [Line Items]                        
Derivative assets 0.9           31.5          
Derivative financial instruments 21.6           0.1          
Forward foreign exchange contracts | Other hedges                        
Derivative [Line Items]                        
Derivative assets 32.5           55.7          
Derivative financial instruments 23.3           42.6          
Interest rate swaps                        
Derivative [Line Items]                        
Notional amount 2,250.0           3,250.0          
Interest rate swaps, fair value (47.9)           (61.6)          
Interest rate swaps | Fair value hedges                        
Derivative [Line Items]                        
Derivative assets 0.2           9.3          
Derivative financial instruments 48.1           70.9          
Derivative financial instruments 0.0           0.0          
Derivative liabilities, noncurrent € 19.9           € 29.3