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RELATED PARTIES - Schedule of Amer Sports Holding (Cayman) Limited transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [line items]      
Total $ 62.1 $ 174.2 $ 158.9
Parent company (Amer Sports Holding (Cayman) Limited)      
Disclosure of transactions between related parties [line items]      
Total 0.0 21.6 226.4
Parent company (Amer Sports Holding (Cayman) Limited) | Investment Loan      
Disclosure of transactions between related parties [line items]      
Total 0.0 19.1 205.0
Parent company (Amer Sports Holding (Cayman) Limited) | Facility A Loan      
Disclosure of transactions between related parties [line items]      
Total $ 0.0 $ 2.5 $ 21.4