RELATED PARTY TRANSACTIONS - Schedule of outstanding transactions with related parties (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Current payables \| ANTA Sports and subsidiaries
Disclosure of transactions between related parties [line items]
Amount payable to related parties	$ 20.2	$ 17.9
Current receivables \| ANTA Sports and subsidiaries
Disclosure of transactions between related parties [line items]
Accounts receivable to related parties	8.5	7.6
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	$ 0.6	$ 0.7

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

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