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v3.25.3

Sales of Receivables - Narrative (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Transfers and Servicing of Financial Assets [Abstract] |
Maximum amount of receivables sold | $ 400

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- Definition Transfers Of Financial Assets Accounted For As Sales, Maximum Amount Of Receivables Sold + References No definition available. + Details
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Namespace Prefix: | amtm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingOfFinancialAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration