Variable Interest Entities (NGHC Joint Venture By Balance Sheet Items) (Details) - USD ($) $ in Millions		Jun. 30, 2026	Sep. 30, 2025
Assets
Cash and cash items		$ 980.5	$ 1,856.0
Trade receivables, net		1,881.5	1,901.2
Prepaid expenses		155.1	174.9
Other receivables and current assets		719.3	689.5
Total Current Assets		4,963.5	5,825.8
Plant and equipment, net		24,995.1	25,337.8
Operating lease right-of-use assets, net		790.6	944.0
Other noncurrent assets		1,653.8	1,021.3
Total Noncurrent Assets		35,482.1	35,233.7
Total Assets	[1]	40,445.6	41,059.5
Liabilities
Payables and accrued liabilities		3,529.6	3,237.7
Accrued income taxes		98.0	179.4
Short-term borrowings		126.7	34.7
Total Current Liabilities		4,575.3	4,218.6
Noncurrent operating lease liabilities		489.8	616.0
Other noncurrent liabilities		1,374.4	1,348.1
Deferred income taxes		638.4	579.6
Total Noncurrent Liabilities		19,273.9	19,491.1
Total Liabilities	[1]	23,849.2	23,709.7
Equity
Accumulated other comprehensive income		(1,990.1)	(2,087.8)
Noncontrolling interests	[1]	2,712.6	2,324.9
Variable Interest Entity, Primary Beneficiary
Assets
Cash and cash items		57.3	40.3
Trade receivables, net		0.0	1.1
Prepaid expenses		12.3	20.7
Other receivables and current assets		142.9	107.2
Total Current Assets		212.5	169.3
Plant and equipment, net		7,494.8	6,593.9
Operating lease right-of-use assets, net		208.6	218.0
Other noncurrent assets		222.5	153.5
Total Noncurrent Assets		7,925.9	6,965.4
Total Assets		8,138.4	7,134.7
Liabilities
Payables and accrued liabilities		129.0	201.7
Accrued income taxes		0.8	1.2
Short-term borrowings		90.1	24.0
Total Current Liabilities		219.9	226.9
Long-term debt		5,212.7	4,677.6
Noncurrent operating lease liabilities		18.2	17.8
Other noncurrent liabilities		4.5	1.6
Deferred income taxes		19.0	13.8
Total Noncurrent Liabilities		5,254.4	4,710.8
Total Liabilities		5,474.3	4,937.7
Equity
Accumulated other comprehensive income		56.6	38.3
Noncontrolling interests		$ 1,831.6	$ 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 $8,138.4 and $7,134.7 as of 30 June 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 $5,474.3 and $4,937.7 as of 30 June 2026 and 30 September 2025, respectively. Refer to Note 3, Variable Interest Entities, for additional information regarding the NEOM Green Hydrogen Company joint venture.