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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of right of return assets and refund liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |
Right of return assets | $ 26.1 | $ 18.2
Refund liabilities | $ 169.8 | $ 115.7

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- Definition The amount of refund liabilities represent the obligation to refund some or all of the consideration receivable from the customer and is measured at the amount Amer Sports expects it will have to return to the customer. + References No definition available. + Details
Name: | as_RefundLiabilities
Namespace Prefix: | as_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of right of return assets which represents Amer Sports' right to recover the products expected to be returned by customers. The asset is measured at the former carrying amount of the inventory less any expected costs to recover the products, including any potential decreases in the value of the returned products. + References No definition available. + Details
Name: | as_RightOfReturnAssets
Namespace Prefix: | as_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration