Business Separation	6 Months Ended
Mar. 31, 2016
Restructuring and Related Activities [Abstract]
Business Separation [Text Block]	4. MATERIALS TECHNOLOGIES SEPARATION On 16 September 2015, the Company announced plans to separate its Materials Technologies business into an independent publicly traded company and distribute to Air Products shareholders all of the shares of the new public company in a tax free distribution (a “spin-off”). Versum Materials, LLC, or Versum, was formed as the new company to hold the Materials Technologies business in November 2015 and is currently a wholly owned subsidiary of the Company. The Company expects to complete the work to prepare Versum to be a separate and independent company during fiscal year 2016 and is assessing market conditions to determine favorability for a spin-off. Versum will be converted from a limited liability company to a Delaware corporation (Versum Materials, Inc.) prior to spin-off. For the three and six months ended 31 March 2016, we incurred separation costs of $7.4 and $19.4, respectively, primarily related to legal and other advisory fees. These fees are reflected on the consolidated income statements as “Business separation costs.” The results of operations, financial condition, and cash flows of the Materials Technologies business continue to be presented within our consolidated financial statements as continuing operations. If the Board of Directors approves the final spin-off and the spin-off occurs, we expect the financial presentation of the historical results of the spun-off business will be reflected as a discontinued operation.

4. MATERIALS TECHNOLOGIES SEPARATION

On 16 September 2015, the Company announced plans to separate its Materials Technologies business into an independent publicly traded company and distribute to Air Products shareholders all of the shares of the new public company in a tax free distribution (a “spin-off”). Versum Materials, LLC, or Versum, was formed as the new company to hold the Materials Technologies business in November 2015 and is currently a wholly owned subsidiary of the Company. The Company expects to complete the work to prepare Versum to be a separate and independent company during fiscal year 2016 and is assessing market conditions to determine favorability for a spin-off. Versum will be converted from a limited liability company to a Delaware corporation (Versum Materials, Inc.) prior to spin-off.

For the three and six months ended 31 March 2016, we incurred separation costs of $7.4 and $19.4, respectively, primarily related to legal and other advisory fees. These fees are reflected on the consolidated income statements as “Business separation costs.” The results of operations, financial condition, and cash flows of the Materials Technologies business continue to be presented within our consolidated financial statements as continuing operations. If the Board of Directors approves the final spin-off and the spin-off occurs, we expect the financial presentation of the historical results of the spun-off business will be reflected as a discontinued operation.