Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Activities
Net income (loss)	$ 1,416.2	$ (1,087.7)
Less: Net income attributable to noncontrolling interests	27.6	25.5
Net Income (Loss) Attributable to Air Products	1,388.6	(1,113.2)
Adjustments to reconcile income to cash provided by operating activities:
Depreciation and amortization	745.7	750.4
Deferred income taxes	125.6	(540.1)
Tax reform repatriation	0.0	(34.9)
Business and asset actions	22.0	2,927.9
Undistributed earnings of equity method investments	(34.7)	(129.4)
Gain on sale of assets and investments	(4.0)	(12.3)
Share-based compensation	26.5	54.7
Noncurrent lease receivables	24.1	28.0
Other adjustments	(18.1)	(87.8)
Working capital changes that provided (used) cash, excluding effects of acquisitions:
Trade receivables	(17.5)	(66.9)
Inventories	5.0	(24.4)
Other receivables	(22.2)	6.5
Payables and accrued liabilities	(246.4)	(47.7)
Other working capital	9.8	(571.0)
Cash Provided by Operating Activities	2,004.4	1,139.8
Investing Activities
Additions to plant and equipment, including long-term deposits	(2,358.8)	(4,009.1)
Investments in and advances to unconsolidated affiliates	(20.0)	(365.4)
Investments in financing receivables	0.0	(35.8)
Proceeds from sale of assets and investments	49.0	36.5
Purchases of short-term investments	0.0	(117.6)
Proceeds from short-term investments	0.0	11.1
Proceeds from other investing activities	11.0	60.9
Cash Used for Investing Activities	(2,318.8)	(4,419.4)
Financing Activities
Long-term debt proceeds	439.2	2,002.5
Payments on long-term debt	(588.7)	(332.3)
Net increase in commercial paper and short-term borrowings	269.7	645.6
Dividends paid to shareholders	(797.0)	(787.4)
Investments by noncontrolling interests	120.5	355.7
Other financing activities	(34.8)	(59.0)
Cash (Used for) Provided by Financing Activities	(591.1)	1,825.1
Effect of Exchange Rate Changes on Cash	0.5	(33.8)
Decrease in cash and cash items	(905.0)	(1,488.3)
Cash and cash items – Beginning of Year	1,856.0	2,979.7
Cash and Cash Items – End of Period	$ 951.0	$ 1,491.4