RELATED PARTY TRANSACTIONS - Narrative (Details) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
|
Mar. 20, 2026
USD ($)
ft²
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
USD ($)
|
|
| Disclosure of transactions between related parties [line items] | |||
| Interest cost on interest bearing debt | $ 11.4 | $ 14.5 | |
| Entity controlled by a member of the board of directors of Amer Sports, Inc. | |||
| Disclosure of transactions between related parties [line items] | |||
| Area of real estate property | ft² | 21,100 | ||
| Extension period | 5 years | ||
| Entity controlled by a member of the board of directors of Amer Sports, Inc. | Bottom of range | |||
| Disclosure of transactions between related parties [line items] | |||
| Future minimum payments | $ 0.6 | ||
| Entity controlled by a member of the board of directors of Amer Sports, Inc. | Top of range | |||
| Disclosure of transactions between related parties [line items] | |||
| Future minimum payments | $ 0.8 | ||