v3.26.1
Right-of-use assets - Schedule of Right-of-Use Assets (Details) - CHF (SFr)
SFr in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance SFr 494.1 SFr 323.6
Lease modification 8.8 4.3
Additions 67.2 228.5
Disposals   (0.1)
Depreciation (45.4) (36.9)
Currency Translation 6.0 (42.8)
Right-of-use assets ending balance 530.7 476.6
Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 692.0 455.9
Right-of-use assets ending balance 773.5 633.2
Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (197.9) (132.3)
Right-of-use assets ending balance (242.8) (156.6)
Storage    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 186.7 100.7
Lease modification 0.2 2.2
Additions 3.4 143.4
Disposals   0.0
Depreciation (16.5) (15.7)
Currency Translation 2.9 (26.4)
Right-of-use assets ending balance 176.7 204.1
Storage | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 265.0 152.8
Right-of-use assets ending balance 271.2 265.0
Storage | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (78.3) (52.1)
Right-of-use assets ending balance (94.5) (60.9)
Stores & showrooms    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 210.8 119.4
Lease modification 6.9 0.6
Additions 63.5 79.5
Disposals   0.0
Depreciation (21.6) (13.7)
Currency Translation 1.7 (13.3)
Right-of-use assets ending balance 261.4 172.4
Stores & showrooms | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 272.3 154.4
Right-of-use assets ending balance 345.7 217.2
Stores & showrooms | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (61.5) (35.0)
Right-of-use assets ending balance (84.3) (44.8)
Offices    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 95.0 101.1
Lease modification 1.7 1.5
Additions 0.3 5.2
Disposals   0.0
Depreciation (6.8) (6.6)
Currency Translation 1.4 (3.0)
Right-of-use assets ending balance 91.5 98.2
Offices | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 144.9 139.1
Right-of-use assets ending balance 147.9 141.5
Offices | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (49.9) (38.0)
Right-of-use assets ending balance (56.4) (43.3)
Cars    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 1.6 2.5
Lease modification 0.0 0.1
Additions 0.1 0.4
Disposals   (0.1)
Depreciation (0.6) (0.9)
Currency Translation 0.0 (0.1)
Right-of-use assets ending balance 1.1 2.0
Cars | Cost    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 9.8 9.6
Right-of-use assets ending balance 8.7 9.5
Cars | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (8.2) (7.1)
Right-of-use assets ending balance SFr (7.6) SFr (7.5)