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Income taxes - Components of Deferred Tax Assets and Liabilities (Details) - CHF (SFr)
SFr in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets SFr (31.7) SFr (2.2) SFr (5.9)
Deferred tax liabilities 17.9 5.6 5.7
Net amount 13.9 (3.4) SFr 0.3
Before offset amount      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (40.9) (9.3)  
Deferred tax liabilities 27.0 12.7  
Net amount 13.9 (3.4)  
Offset amount      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (9.1) (7.1)  
Deferred tax liabilities 9.1 7.1  
Trade receivables      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 (0.1)  
Deferred tax liabilities 1.0 1.0  
Net amount (1.0) (0.9)  
Inventories      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (23.4) (0.6)  
Deferred tax liabilities 15.4 3.9  
Net amount 7.9 (3.3)  
Other current assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (0.7) (0.7)  
Deferred tax liabilities 0.0 0.0  
Net amount 0.7 0.7  
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 0.0  
Deferred tax liabilities 0.1 0.1  
Net amount (0.1) (0.1)  
Right-of-use assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 0.0  
Deferred tax liabilities 6.4 3.8  
Net amount (6.4) (3.8)  
Intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets 0.0 0.0  
Deferred tax liabilities 3.3 3.1  
Net amount (3.3) (3.1)  
Other current financial liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (1.1) (0.8)  
Deferred tax liabilities 0.0 0.0  
Net amount 1.1 0.8  
Other current operating liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (7.1) 0.0  
Deferred tax liabilities 0.8 0.9  
Net amount 6.3 (0.9)  
Current provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (0.1) (0.1)  
Deferred tax liabilities 0.0 0.0  
Net amount 0.1 0.1  
Employee benefit obligations      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (1.2) (1.2)  
Deferred tax liabilities 0.0 0.0  
Net amount 1.2 1.2  
Non-current provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (0.4) (0.1)  
Deferred tax liabilities 0.0 0.0  
Net amount 0.4 0.1  
Other non-current financial liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (5.6) (3.1)  
Deferred tax liabilities 0.0 0.0  
Net amount 5.6 3.1  
Tax loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Assets (1.2) (2.6)  
Deferred tax liabilities 0.0 0.0  
Net amount SFr 1.2 SFr 2.6