Acquisitions	12 Months Ended
Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONS Fiscal Year 2023 Uzbekistan Asset Purchase On 25 May 2023, we entered into an investment agreement with the Government of the Republic of Uzbekistan and Uzbekneftegaz JSC (“UNG”) to purchase a natural gas-to-syngas processing facility in Qashqadaryo Province, Uzbekistan, for $1 billion. Under the agreement, Air Products will acquire, own, and operate the facility and supply all offtake products to UNG under a 15-year on-site contract, with UNG supplying the feedstock natural gas and utilities. We are accounting for the transaction as a financing arrangement because UNG has the right to reacquire the facility at the end of the contract term. Accordingly, progress payments of approximately $800, of which $600 was completed during fiscal year 2023, are reflected within "Financing Receivables" on our consolidated balance sheet as of 30 September 2023. The progress payments are reflected within “Investment in financing receivables” on our consolidated statement of cash flows. In early fiscal year 2024, we made an additional progress payment of $100. Fiscal Year 2021 Gain on Exchange With Joint Venture Partner We previously held a 50% ownership interest in Tyczka Industrie-Gases GmbH ("TIG"), a joint venture in Germany with the Tyczka Group that was primarily a merchant gases business. We accounted for this arrangement as an equity method investment in our former Industrial Gases – EMEA segment. Effective 23 February 2021 (the "acquisition date"), TIG was separated into two businesses, one of which we acquired on a 100% basis. Our partner paid us $10.8 to acquire the other business. The exchange resulted in a gain of $36.8 ($27.3 after-tax), which is reflected as “Gain on exchange with joint venture partner” on our consolidated income statements for the fiscal year ended 30 September 2021. The gain included $12.7 from the revaluation of our previously held equity interest in the portion of the business that we retained and $24.1 from the sale of our equity interest in the remaining business. The gain was not recorded in segment results. We estimated an acquisition date fair value of $15.4 for our previously held equity interest in the acquired portion of the business using a market approach, which considered historical earnings and the application of a market-based multiple derived from comparable transactions. We accounted for the acquisition as a business combination. The results of this business are consolidated within our Europe segment.
Business Combinations	ACQUISITIONS Fiscal Year 2023 Uzbekistan Asset Purchase On 25 May 2023, we entered into an investment agreement with the Government of the Republic of Uzbekistan and Uzbekneftegaz JSC (“UNG”) to purchase a natural gas-to-syngas processing facility in Qashqadaryo Province, Uzbekistan, for $1 billion. Under the agreement, Air Products will acquire, own, and operate the facility and supply all offtake products to UNG under a 15-year on-site contract, with UNG supplying the feedstock natural gas and utilities. We are accounting for the transaction as a financing arrangement because UNG has the right to reacquire the facility at the end of the contract term. Accordingly, progress payments of approximately $800, of which $600 was completed during fiscal year 2023, are reflected within "Financing Receivables" on our consolidated balance sheet as of 30 September 2023. The progress payments are reflected within “Investment in financing receivables” on our consolidated statement of cash flows. In early fiscal year 2024, we made an additional progress payment of $100. Fiscal Year 2021 Gain on Exchange With Joint Venture Partner We previously held a 50% ownership interest in Tyczka Industrie-Gases GmbH ("TIG"), a joint venture in Germany with the Tyczka Group that was primarily a merchant gases business. We accounted for this arrangement as an equity method investment in our former Industrial Gases – EMEA segment. Effective 23 February 2021 (the "acquisition date"), TIG was separated into two businesses, one of which we acquired on a 100% basis. Our partner paid us $10.8 to acquire the other business. The exchange resulted in a gain of $36.8 ($27.3 after-tax), which is reflected as “Gain on exchange with joint venture partner” on our consolidated income statements for the fiscal year ended 30 September 2021. The gain included $12.7 from the revaluation of our previously held equity interest in the portion of the business that we retained and $24.1 from the sale of our equity interest in the remaining business. The gain was not recorded in segment results. We estimated an acquisition date fair value of $15.4 for our previously held equity interest in the acquired portion of the business using a market approach, which considered historical earnings and the application of a market-based multiple derived from comparable transactions. We accounted for the acquisition as a business combination. The results of this business are consolidated within our Europe segment.

Acquisitions

12 Months Ended

Sep. 30, 2023

Business Combination and Asset Acquisition [Abstract]

ACQUISITIONS

Fiscal Year 2023

Uzbekistan Asset Purchase

On 25 May 2023, we entered into an investment agreement with the Government of the Republic of Uzbekistan and Uzbekneftegaz JSC (“UNG”) to purchase a natural gas-to-syngas processing facility in Qashqadaryo Province, Uzbekistan, for $1 billion. Under the agreement, Air Products will acquire, own, and operate the facility and supply all offtake products to UNG under a 15-year on-site contract, with UNG supplying the feedstock natural gas and utilities.

We are accounting for the transaction as a financing arrangement because UNG has the right to reacquire the facility at the end of the contract term. Accordingly, progress payments of approximately $800, of which $600 was completed during fiscal year 2023, are reflected within "Financing Receivables" on our consolidated balance sheet as of 30 September 2023. The progress payments are reflected within “Investment in financing receivables” on our consolidated statement of cash flows. In early fiscal year 2024, we made an additional progress payment of $100.

Fiscal Year 2021

Gain on Exchange With Joint Venture Partner

We previously held a 50% ownership interest in Tyczka Industrie-Gases GmbH ("TIG"), a joint venture in Germany with the Tyczka Group that was primarily a merchant gases business. We accounted for this arrangement as an equity method investment in our former Industrial Gases – EMEA segment.

Effective 23 February 2021 (the "acquisition date"), TIG was separated into two businesses, one of which we acquired on a 100% basis. Our partner paid us $10.8 to acquire the other business. The exchange resulted in a gain of $36.8 ($27.3 after-tax), which is reflected as “Gain on exchange with joint venture partner” on our consolidated income statements for the fiscal year ended 30 September 2021. The gain included $12.7 from the revaluation of our previously held equity interest in the portion of the business that we retained and $24.1 from the sale of our equity interest in the remaining business. The gain was not recorded in segment results.

We estimated an acquisition date fair value of $15.4 for our previously held equity interest in the acquired portion of the business using a market approach, which considered historical earnings and the application of a market-based multiple derived from comparable transactions.