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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
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.

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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.

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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
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