Variable Interest Entities - NGHC Joint Venture By Balance Sheet Items (Details) - USD ($) $ in Millions		Mar. 31, 2025	Sep. 30, 2024
Assets
Cash and cash items		$ 1,491.4	$ 2,979.7
Trade receivables, net		1,845.9	1,821.6
Prepaid expenses		261.6	179.9
Other receivables and current assets		707.6	610.8
Total Current Assets		5,187.6	6,363.0
Plant and equipment, net		24,033.4	23,370.9
Operating lease right-of-use assets, net		970.3	1,047.7
Other noncurrent assets		1,094.7	1,171.5
Total Noncurrent Assets		33,685.3	33,211.6
Total Assets	[1]	38,872.9	39,574.6
Liabilities
Payables and accrued liabilities		3,423.9	2,926.2
Accrued income taxes		182.8	558.5
Short-term borrowings		773.2	83.5
Total Current Liabilities		5,210.6	4,179.6
Noncurrent operating lease liabilities		637.4	677.9
Other noncurrent liabilities		1,320.9	1,350.5
Deferred income taxes		670.4	1,159.9
Total Noncurrent Liabilities		16,882.7	16,721.3
Total Liabilities	[1]	22,093.3	20,900.9
Equity
Accumulated other comprehensive income		(2,477.7)	(2,027.7)
Noncontrolling interests	[1]	2,076.2	1,637.2
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company
Assets
Cash and cash items		12.8	34.5
Trade receivables, net		1.2	6.7
Prepaid expenses		36.8	31.2
Other receivables and current assets		132.1	120.6
Total Current Assets		182.9	193.0
Plant and equipment, net		5,643.1	3,929.9
Operating lease right-of-use assets, net		224.0	233.9
Other noncurrent assets		175.5	37.1
Total Noncurrent Assets		6,042.6	4,200.9
Total Assets		6,225.5	4,393.9
Liabilities
Payables and accrued liabilities		344.8	308.4
Accrued income taxes		0.9	2.0
Short-term borrowings		64.4	51.6
Total Current Liabilities		410.1	362.0
Long-term debt		3,997.1	3,053.3
Noncurrent operating lease liabilities		18.5	24.5
Other noncurrent liabilities		40.7	30.4
Deferred income taxes		13.1	3.2
Total Noncurrent Liabilities		4,069.4	3,111.4
Total Liabilities		4,479.5	3,473.4
Equity
Accumulated other comprehensive income		44.2	13.8
Noncontrolling interests		$ 1,281.6	$ 937.6

[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 $6,225.5 and $4,393.9 as of 31 March 2025 and 30 September 2024, 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 $4,479.5 and $3,473.4 as of 31 March 2025 and 30 September 2024, respectively. Refer to Note 3, Variable Interest Entities, for additional information regarding the NEOM Green Hydrogen Company joint venture.