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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2024
Commitments and Contingencies [Abstract]  
Schedule of Contractual Obligation of Leases The total committed future outflow resulting of these lease contracts amounts to:
(CHF in millions)12/31/202412/31/2023
Due < 1 year16.9 15.8 
Due 1 - 5 years135.8 145.4 
Due > 5 years178.5 224.5 
Commitments for future lease obligations331.1 385.7 
Contractual maturities of On’s undiscounted financial liabilities:

(CHF in millions)Due
< 3 months		Due
4 to 12 months		Due
1 to 5 years		Due
> 5 years		12/31/2024
Trade payables166.5 — — — 166.5 
Current lease liabilities19.1 25.1 — — 44.2 
Other financial liabilities36.5 14.8 — — 51.3
Other current financial liabilities55.7 39.8 — — 95.5 
Non-current lease liabilities— — 211.4 123.7 335.1
Other non-current financial liabilities— — 1.7 — 1.7
Other non-current financial liabilities— — 213.1 123.7 336.8 

(CHF in millions)Due
< 3 months		Due
4 to 12 months		Due
1 to 5 years		Due
> 5 years		12/31/2023
Trade payables65.1 — — — 65.1 
Current lease liabilities11.7 35.2 — — 46.9 
Other financial liabilities14.8 — — — 14.8 
Other current financial liabilities26.5 35.2 — — 61.7 
Non-current lease liabilities— — 135.1 81.3 216.4 
Other non-current financial liabilities— — 135.1 81.3 216.4