Variable Interest Entities - NGHC Joint Venture By Balance Sheet Items (Details) - USD ($) $ in Millions		Dec. 31, 2024	Sep. 30, 2024
Assets
Cash and cash items		$ 1,845.5	$ 2,979.7
Trade receivables, net		1,807.4	1,821.6
Prepaid expenses		201.8	179.9
Other receivables and current assets		640.5	610.8
Total Current Assets		5,351.7	6,363.0
Plant and equipment, net		24,730.8	23,370.9
Operating lease right-of-use assets, net		1,017.4	1,047.7
Other noncurrent assets		1,410.1	1,171.5
Total Noncurrent Assets		34,665.5	33,211.6
Total Assets	[1]	40,017.2	39,574.6
Liabilities
Payables and accrued liabilities		3,023.7	2,926.2
Accrued income taxes		586.1	558.5
Short-term borrowings		68.2	83.5
Total Current Liabilities		4,809.4	4,179.6
Noncurrent operating lease liabilities		655.1	677.9
Other noncurrent liabilities		1,348.1	1,350.5
Deferred income taxes		1,195.0	1,159.9
Total Noncurrent Liabilities		16,469.1	16,721.3
Total Liabilities	[1]	21,278.5	20,900.9
Equity
Accumulated other comprehensive income		(2,586.2)	(2,027.7)
Noncontrolling interests	[1]	2,046.4	1,637.2
Variable Interest Entity, Primary Beneficiary | NEOM Green Hydrogen Company
Assets
Cash and cash items		24.0	34.5
Trade receivables, net		15.4	6.7
Prepaid expenses		30.7	31.2
Other receivables and current assets		126.3	120.6
Total Current Assets		196.4	193.0
Plant and equipment, net		5,015.4	3,929.9
Operating lease right-of-use assets, net		226.2	233.9
Other noncurrent assets		254.4	37.1
Total Noncurrent Assets		5,496.0	4,200.9
Total Assets		5,692.4	4,393.9
Liabilities
Payables and accrued liabilities		358.3	308.4
Accrued income taxes		0.8	2.0
Short-term borrowings		60.4	51.6
Total Current Liabilities		419.5	362.0
Long-term debt		3,499.4	3,053.3
Noncurrent operating lease liabilities		19.7	24.5
Other noncurrent liabilities		35.4	30.4
Deferred income taxes		20.1	3.2
Total Noncurrent Liabilities		3,574.6	3,111.4
Total Liabilities		3,994.1	3,473.4
Equity
Accumulated other comprehensive income		61.8	13.8
Noncontrolling interests		$ 1,255.3	$ 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 $5,692.4 and $4,393.9 as of 31 December 2024 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 $3,994.1 and $3,473.4 as of 31 December 2024 and 30 September 2024, respectively. Refer to Note 3, Variable Interest Entities, for additional information regarding the NEOM Green Hydrogen Company joint venture.