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Income taxes - Components of Deferred Tax Assets and Liabilities (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets SFr 107.8 SFr 69.5 SFr 31.7
Liabilities (10.8) (10.5) (17.9)
Net amount 97.1 59.1 SFr 13.9
Before offset amount      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 168.5 80.0  
Liabilities (71.4) (21.0)  
Net amount 97.1 59.1  
Offset amount      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 60.6 10.5  
Liabilities (60.6) (10.5)  
Net amount 0.0 0.0  
Inventories      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 81.5 50.1  
Liabilities (9.9) (8.0)  
Net amount 71.6 42.0  
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.3 0.1  
Liabilities (6.2) (0.1)  
Net amount (5.9) 0.1  
Right-of-use assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 0.0  
Liabilities (50.6) (6.2)  
Net amount (50.6) (6.2)  
Intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 0.0  
Liabilities (2.9) (3.0)  
Net amount (2.9) (3.0)  
Other current financial liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 46.7 1.1  
Liabilities 0.0 (0.1)  
Net amount 46.7 1.0  
Other current operating liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 17.2 17.2  
Liabilities (0.7) (2.6)  
Net amount 16.5 14.6  
Other non-current financial liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 12.8 6.2  
Liabilities 0.0 0.0  
Net amount 12.8 6.2  
Tax loss and tax credit carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 4.6 3.6  
Liabilities 0.0 0.0  
Net amount 4.6 3.6  
Other assets and liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 5.3 1.7  
Liabilities (1.2) (1.0)  
Net amount SFr 4.1 SFr 0.7