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Supplemental Information	6 Months Ended
Supplemental Information	Mar. 31, 2026
Disclosure Text Block Supplement [Abstract]
Supplemental Information	SUPPLEMENTAL INFORMATION Related Party Transactions We have related party sales to some of our equity affiliates and joint venture partners as well as other income primarily from fees charged for use of Air Products' patents and technology. Sales to and other income from related parties totaled approximately $105 and $190 for the three and six months ended 31 March 2026, respectively, and $70 and $150 for the three and six months ended 31 March 2025, respectively. Sales agreements with related parties include terms that are consistent with those that we believe would have been negotiated at an arm’s length with an independent party. As of 31 March 2026 and 30 September 2025, our consolidated balance sheets included related party trade receivables of approximately $205 and $105, respectively. Related party debt consists of shareholder loans with our joint venture partner, Lu’An Clean Energy Company. Total debt owed to related parties was $244.3 and $236.5 as of 31 March 2026 and 30 September 2025, respectively. These amounts included $61.0 and $59.0, respectively, in "Current portion of long-term debt" on the consolidated balance sheets. Prior-Year Shareholder Activism-Related Costs We recorded shareholder activism-related costs in fiscal year 2025 in connection with a proxy contest that concluded in January 2025 following certification of the election of directors at the 2025 Annual Meeting of Shareholders. Costs of $31.4 ($31.0 after tax) incurred during the second quarter of fiscal year 2025 primarily reflect executive separation costs for our former chief executive officer following the Board of Directors’ appointment of a new chief executive officer, which included a noncash expense of $22.4 related to the acceleration of vesting of share‑based awards and $7.3 in severance and other cash benefits. Costs of $61.3 ($52.9 after tax) incurred during the first six months of fiscal year 2025 also included legal and other professional service fees, as well as incremental proxy solicitation costs related to the 2025 Annual Meeting of Shareholders, which were largely incurred during the first quarter of fiscal year 2025. Changes in Estimates Changes in estimates on sale of equipment projects accounted for under the cost incurred input method are recognized as a cumulative adjustment for the inception-to-date effect of such change. We recorded changes to project revenue and cost estimates that unfavorably impacted operating income by approximately $25 and $58 for the three and six months ended 31 March 2026, respectively, and operating loss by approximately $15 and $45 for the three and six months ended 31 March 2025, respectively.