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Share capital - Narrative (Details) - CHF (SFr) SFr / shares in Units, SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of classes of share capital [line items]
Share capital	SFr 33.7	SFr 33.5
Share capital, paid-in percentage	100.00%
Proceeds on sale of treasury shares related to share-based compensation	SFr 10.9	10.1	SFr 26.4
Sale of treasury shares	0.4	0.8	1.6
Treasury shares
Disclosure of classes of share capital [line items]
Sale of treasury shares	SFr 0.4	SFr 0.8	SFr 1.6
Class A
Disclosure of classes of share capital [line items]
Number of shares registered (in shares)	302,455,664	299,998,125	299,998,125
Par value per share (in CHF per share)	SFr 0.10
Class A | Treasury shares
Disclosure of classes of share capital [line items]
Sale of shares held by On in treasury (in shares)	2,633,847	2,273,239
Purchase of On shares from employees (sell-to-cover) at current market price (in shares)	10,320	34,349
Class B
Disclosure of classes of share capital [line items]
Number of shares registered (in shares)	345,437,500	345,437,500	345,437,500
Par value per share (in CHF per share)	SFr 0.01

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