v3.25.4
Right-of-use assets - Schedule of Right-of-Use Assets (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance SFr 323.6 SFr 214.0
Lease modification 6.4 6.4
Additions 291.2 153.8
Disposals (0.1) (0.2)
Depreciation (79.4) (60.8)
Impairment (1.7)  
Exchange Difference (45.9) 10.3
Right-of-use assets ending balance 494.1 323.6
Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 455.9 283.1
Right-of-use assets ending balance 692.0 455.9
Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (132.3) (69.1)
Right-of-use assets ending balance (197.9) (132.3)
Storage    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 100.7 65.3
Lease modification 2.2 0.1
Additions 143.4 57.4
Disposals 0.0 0.0
Depreciation (33.5) (28.0)
Impairment 0.0  
Exchange Difference (26.1) 5.8
Right-of-use assets ending balance 186.7 100.7
Storage | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 152.8 87.5
Right-of-use assets ending balance 265.0 152.8
Storage | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (52.1) (22.1)
Right-of-use assets ending balance (78.3) (52.1)
Stores & showrooms    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 119.4 55.1
Lease modification 2.6 4.4
Additions 137.8 76.2
Disposals 0.0 (0.2)
Depreciation (30.9) (19.3)
Impairment (1.7)  
Exchange Difference (16.3) 3.1
Right-of-use assets ending balance 210.8 119.4
Stores & showrooms | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 154.4 70.5
Right-of-use assets ending balance 272.3 154.4
Stores & showrooms | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (35.0) (15.4)
Right-of-use assets ending balance (61.5) (35.0)
Offices    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 101.1 90.8
Lease modification 1.6 1.9
Additions 9.2 18.7
Disposals 0.0 0.0
Depreciation (13.4) (11.6)
Impairment 0.0  
Exchange Difference (3.5) 1.3
Right-of-use assets ending balance 95.0 101.1
Offices | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 139.1 116.9
Right-of-use assets ending balance 144.9 139.1
Offices | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (38.0) (26.1)
Right-of-use assets ending balance (49.9) (38.0)
Cars    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 2.5 2.8
Lease modification 0.1 0.0
Additions 0.8 1.4
Disposals (0.1) (0.1)
Depreciation (1.6) (1.8)
Impairment 0.0  
Exchange Difference (0.1) 0.0
Right-of-use assets ending balance 1.6 2.5
Cars | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 9.6 8.1
Right-of-use assets ending balance 9.8 9.6
Cars | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (7.1) (5.4)
Right-of-use assets ending balance SFr (8.2) SFr (7.1)