Variable Interest Entities - NGHC Joint Venture by Balance Sheet Items (Details) - USD ($) $ in Millions		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Assets
Cash and cash items		$ 2,979.7	$ 1,617.0
Trade receivables, net		1,821.6	1,700.4
Prepaid expenses		179.9	177.0
Other receivables and current assets		610.8	722.1
Total current assets		6,363.0	5,200.5
Plant and equipment, net		23,370.9	17,472.1	$ 14,160.5
Operating lease right-of-use assets, net		1,047.7	974.0
Other noncurrent assets		1,171.5	1,229.9
Total noncurrent assets		33,211.6	26,802.0
Total assets	[1]	39,574.6	32,002.5
Liabilities
Payables and accrued liabilities		2,926.2	2,890.1
Accrued income taxes		558.5	131.2
Short-term borrowings		83.5	259.5
Total current liabilities		4,179.6	3,895.8
Noncurrent operating lease liabilities		677.9	631.1
Other noncurrent liabilities		1,350.5	1,118.0
Deferred income taxes		1,159.9	1,266.0
Total noncurrent liabilities		16,721.3	12,446.4
Total liabilities	[1]	20,900.9	16,342.2
Equity
Accumulated other comprehensive income		(2,027.7)	(2,449.4)
Noncontrolling interests	[1]	1,637.2	1,347.4
Nonrelated Party
Liabilities
Long-term debt		13,428.6	9,280.6
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company
Assets
Cash and cash items		34.5	78.2
Trade receivables, net		6.7	0.0
Prepaid expenses		31.2	21.4
Other receivables and current assets		120.6	181.6
Total current assets		193.0	281.2
Plant and equipment, net		3,929.9	1,396.1
Operating lease right-of-use assets, net		233.9	228.9
Other noncurrent assets		37.1	350.6
Total noncurrent assets		4,200.9	1,975.6
Total assets		4,393.9	2,256.8
Liabilities
Payables and accrued liabilities		308.4	141.0
Accrued income taxes		2.0	0.6
Short-term borrowings		51.6	0.0
Total current liabilities		362.0	141.6
Noncurrent operating lease liabilities		24.5	18.9
Other noncurrent liabilities		30.4	2.1
Deferred income taxes		3.2	24.1
Total noncurrent liabilities		3,111.4	1,319.5
Total liabilities		3,473.4	1,461.1
Equity
Accumulated other comprehensive income		13.8	77.7
Noncontrolling interests		937.6	723.6
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company | Nonrelated Party
Liabilities
Long-term debt		$ 3,053.3	$ 1,274.4

[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 $4,393.9 and $2,256.8 as of 30 September 2024 and 30 September 2023, 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 $3,473.4 and $1,461.1 as of 30 September 2024 and 30 September 2023, respectively. Refer to Note 3, Variable Interest Entities, for additional information.