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Right-of-use assets - Schedule of Right-of-Use Assets (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance SFr 214.0 SFr 151.6
Lease modification 6.4 2.0
Additions 153.8 103.4
Disposals (0.2) (0.4)
Depreciation (60.8) (32.9)
Exchange Difference 10.3 (9.8)
Right-of-use assets ending balance 323.6 214.0
Gross Carrying Amount    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 283.1 192.7
Right-of-use assets ending balance 455.9 283.1
Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (69.1) (41.1)
Right-of-use assets ending balance (132.3) (69.1)
Storage    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 65.3 16.8
Lease modification 0.1 (2.1)
Additions 57.4 66.0
Disposals 0.0 (0.1)
Depreciation (28.0) (11.8)
Exchange Difference 5.8 (3.3)
Right-of-use assets ending balance 100.7 65.3
Storage | Gross Carrying Amount    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 87.5 28.7
Right-of-use assets ending balance 152.8 87.5
Storage | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (22.1) (11.9)
Right-of-use assets ending balance (52.1) (22.1)
Stores & showrooms    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 55.1 37.9
Lease modification 4.4 3.3
Additions 76.2 27.1
Disposals (0.2) 0.0
Depreciation (19.3) (9.2)
Exchange Difference 3.1 (4.1)
Right-of-use assets ending balance 119.4 55.1
Stores & showrooms | Gross Carrying Amount    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 70.5 45.6
Right-of-use assets ending balance 154.4 70.5
Stores & showrooms | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (15.4) (7.7)
Right-of-use assets ending balance (35.0) (15.4)
Offices    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 90.8 94.2
Lease modification 1.9 0.7
Additions 18.7 8.0
Disposals 0.0 0.0
Depreciation (11.6) (10.0)
Exchange Difference 1.3 (2.1)
Right-of-use assets ending balance 101.1 90.8
Offices | Gross Carrying Amount    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 116.9 111.0
Right-of-use assets ending balance 139.1 116.9
Offices | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (26.1) (16.8)
Right-of-use assets ending balance (38.0) (26.1)
Cars    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 2.8 2.8
Lease modification 0.0 0.0
Additions 1.4 2.3
Disposals (0.1) (0.3)
Depreciation (1.8) (1.9)
Exchange Difference 0.0 (0.2)
Right-of-use assets ending balance 2.5 2.8
Cars | Gross Carrying Amount    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance 8.1 7.4
Right-of-use assets ending balance 9.6 8.1
Cars | Accumulated depreciation    
Reconciliation of changes in right-of-use assets [abstract]    
Right-of-use assets beginning balance (5.4) (4.6)
Right-of-use assets ending balance SFr (7.1) SFr (5.4)