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Income Taxes - Effective Tax Rate-Shareholder Activism-Related Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Legal, executive separation, and other professional service fees in connection with response to proxy contest | $ 25.0 | $ 0.0 | $ 86.3 | $ 0.0
Net tax benefit related to legal, executive separation, and other professional service fees in connection with response to proxy contest |  |  | $ 14.6 |

X
- Definition Costs incurred as a result of a proxy contest for legal, proxy solicitation, executive separation costs, and other professional service fees. + References No definition available. + Details
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Namespace Prefix: | apd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net tax benefit related to costs incurred as a result of a proxy contest for legal, proxy solicitation, executive separation costs, and other professional service fees. + References No definition available. + Details
Name: | apd_ShareholderActivismCostsNetTaxBenefit
Namespace Prefix: | apd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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