Variable Interest Entities (NGHC Joint Venture By Balance Sheet Items) (Details) - USD ($) $ in Millions		Mar. 31, 2026	Sep. 30, 2025
Assets
Cash and cash items		$ 951.0	$ 1,856.0
Trade receivables, net		1,937.7	1,901.2
Prepaid expenses		171.2	174.9
Other receivables and current assets		717.8	689.5
Total Current Assets		5,012.6	5,825.8
Plant and equipment, net		26,693.7	25,337.8
Operating lease right-of-use assets, net		917.8	944.0
Other noncurrent assets		1,122.4	1,021.3
Total Noncurrent Assets		36,632.1	35,233.7
Total Assets	[1]	41,644.7	41,059.5
Liabilities
Payables and accrued liabilities		2,856.9	3,237.7
Accrued income taxes		118.7	179.4
Short-term borrowings		314.4	34.7
Total Current Liabilities		3,513.3	4,218.6
Noncurrent operating lease liabilities		600.1	616.0
Other noncurrent liabilities		1,378.6	1,348.1
Deferred income taxes		733.0	579.6
Total Noncurrent Liabilities		19,981.6	19,491.1
Total Liabilities	[1]	23,494.9	23,709.7
Equity
Accumulated other comprehensive income		(2,057.5)	(2,087.8)
Noncontrolling interests	[1]	2,499.9	2,324.9
Variable Interest Entity, Primary Beneficiary
Assets
Cash and cash items		54.8	40.3
Trade receivables, net		11.2	1.1
Prepaid expenses		14.9	20.7
Other receivables and current assets		125.4	107.2
Total Current Assets		206.3	169.3
Plant and equipment, net		7,282.1	6,593.9
Operating lease right-of-use assets, net		210.6	218.0
Other noncurrent assets		197.0	153.5
Total Noncurrent Assets		7,689.7	6,965.4
Total Assets		7,896.0	7,134.7
Liabilities
Payables and accrued liabilities		128.0	201.7
Accrued income taxes		3.0	1.2
Short-term borrowings		46.5	24.0
Total Current Liabilities		177.5	226.9
Long-term debt		5,080.2	4,677.6
Noncurrent operating lease liabilities		18.0	17.8
Other noncurrent liabilities		2.7	1.6
Deferred income taxes		17.2	13.8
Total Noncurrent Liabilities		5,118.1	4,710.8
Total Liabilities		5,295.6	4,937.7
Equity
Accumulated other comprehensive income		49.6	38.3
Noncontrolling interests		$ 1,640.2	$ 1,493.6

[1] Includes balances associated with a consolidated variable interest entity ("VIE"), including amounts reflected in "Total Assets" that can only be used to settle obligations of the VIE of $7,896.0 and $7,134.7 as of 31 March 2026 and 30 September 2025, respectively, as well as liabilities of the VIE reflected within "Total Liabilities" for which creditors do not have recourse to the general credit of Air Products of $5,295.6 and $4,937.7 as of 31 March 2026 and 30 September 2025, respectively. Refer to Note 3, Variable Interest Entities, for additional information regarding the NEOM Green Hydrogen Company joint venture.