Variable Interest Entities - NGHC Joint Venture By Balance Sheet Items (Details) - USD ($) $ in Millions		Jun. 30, 2025	Sep. 30, 2024
Assets
Cash and cash items		$ 2,324.3	$ 2,979.7
Trade receivables, net		1,943.5	1,821.6
Prepaid expenses		234.0	179.9
Other receivables and current assets		848.1	610.8
Total Current Assets		6,147.6	6,363.0
Plant and equipment, net		25,640.0	23,370.9
Operating lease right-of-use assets, net		976.9	1,047.7
Other noncurrent assets		1,093.2	1,171.5
Total Noncurrent Assets		35,511.5	33,211.6
Total Assets	[1]	41,659.1	39,574.6
Liabilities
Payables and accrued liabilities		3,368.1	2,926.2
Accrued income taxes		156.3	558.5
Short-term borrowings		536.2	83.5
Total Current Liabilities		4,759.6	4,179.6
Noncurrent operating lease liabilities		646.6	677.9
Other noncurrent liabilities		1,351.8	1,350.5
Deferred income taxes		673.9	1,159.9
Total Noncurrent Liabilities		19,131.5	16,721.3
Total Liabilities	[1]	23,891.1	20,900.9
Equity
Accumulated other comprehensive income		(1,969.8)	(2,027.7)
Noncontrolling interests	[1]	2,230.5	1,637.2
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company
Assets
Cash and cash items		38.4	34.5
Trade receivables, net		12.7	6.7
Prepaid expenses		18.9	31.2
Other receivables and current assets		143.4	120.6
Total Current Assets		213.4	193.0
Plant and equipment, net		6,154.8	3,929.9
Operating lease right-of-use assets, net		220.3	233.9
Other noncurrent assets		170.6	37.1
Total Noncurrent Assets		6,545.7	4,200.9
Total Assets		6,759.1	4,393.9
Liabilities
Payables and accrued liabilities		295.8	308.4
Accrued income taxes		0.3	2.0
Short-term borrowings		71.0	51.6
Total Current Liabilities		367.1	362.0
Long-term debt		4,284.3	3,053.3
Noncurrent operating lease liabilities		18.1	24.5
Other noncurrent liabilities		9.4	30.4
Deferred income taxes		15.0	3.2
Total Noncurrent Liabilities		4,326.8	3,111.4
Total Liabilities		4,693.9	3,473.4
Equity
Accumulated other comprehensive income		42.3	13.8
Noncontrolling interests		$ 1,397.1	$ 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 $6,759.1 and $4,393.9 as of 30 June 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 $4,693.9 and $3,473.4 as of 30 June 2025 and 30 September 2024, respectively. Refer to Note 3, Variable Interest Entities, for additional information regarding the NEOM Green Hydrogen Company joint venture.