RELATED PARTY TRANSACTIONS - Balances outstanding (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Current payables \| ANTA Sports and subsidiaries
Disclosure of transactions between related parties [line items]
Amount payable to related parties	$ 15.3	$ 11.3
Current receivables \| ANTA Sports and subsidiaries
Disclosure of transactions between related parties [line items]
Accounts receivable to related parties	11.5	10.4
Right-of-use asset / Lease liability \| Entity controlled by a member of the board of directors of Amer Sports, Inc.
Disclosure of transactions between related parties [line items]
Amount payable to related parties	$ 0.7	$ 0.8

The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]]

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