Air Products and Chemicals (APD) 10-Q 23 Apr 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page	6 Months Ended
	Mar. 31, 2020shares
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-04534
Entity Registrant Name	AIR PRODUCTS AND CHEMICALS, INC.
Entity Central Index Key	0000002969
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-1274455
Entity Address, Address Line One	7201 Hamilton Boulevard
Entity Address, City or Town	Allentown
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18195-1501
City Area Code	610
Local Phone Number	481-4911
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	220,854,647
Common Stock, par value $1.00 per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	APD
Security Exchange Name	NYSE
2.000% Euro Notes due 2020
Entity Information [Line Items]
Title of 12(b) Security	2.000% Euro Notes due 2020
Trading Symbol	APD20
Security Exchange Name	NYSE
0.375% Euro Notes due 2021
Entity Information [Line Items]
Title of 12(b) Security	0.375% Euro Notes due 2021
Trading Symbol	APD21B
Security Exchange Name	NYSE
1.000% Euro Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	1.000% Euro Notes due 2025
Trading Symbol	APD25
Security Exchange Name	NYSE

Consolidated Income Statements

Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Sales		$ 2,216.3	$ 2,187.7	$ 4,471	$ 4,411.7
Cost of sales		1,460.1	1,474.7	2,946.7	3,018.7
Facility closure		0	0	0	29
Selling and administrative		201.7	190	403.4	379.6
Research and development		19.2	16.9	36.9	31.9
Company headquarters relocation income (expense)		33.8	0	33.8	0
Other income (expense), net		8.1	10.4	20.4	19
Operating Income		577.2	516.5	1,138.2	971.5
Equity affiliates' income		88.2	46.2	146.4	99.1
Interest expense		19.3	35.4	38	72.7
Other non-operating income (expense), net		7.1	13.7	16.2	32.2
Income From Continuing Operations Before Taxes		653.2	541	1,262.8	1,030.1
Income tax provision		148.5	107.5	269.2	239.6
Income From Continuing Operations		504.7	433.5	993.6	790.5
Loss from discontinued operations, net of tax		(14.3)	0	(14.3)	0
Net Income		490.4	433.5	979.3	790.5
Less: Net income attributable to noncontrolling interests of continuing operations		12.6	12.2	25.9	21.7
Net Income Attributable to Air Products		477.8	421.3	953.4	768.8
Net income from continuing operations		492.1	421.3	967.7	768.8
Net loss from discontinued operations		$ (14.3)	$ 0	$ (14.3)	$ 0
Basic earnings per share from continuing operations (in dollars per share)	[1]	$ 2.22	$ 1.91	$ 4.38	$ 3.49
Basic earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Basic Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	2.16	1.91	4.31	3.49
Diluted earnings per share from continuing operations (in dollars per share)	[1]	2.21	1.90	4.36	3.48
Diluted earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Diluted Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	$ 2.15	$ 1.90	$ 4.29	$ 3.48
Weighted Average Common Shares - Basic (in millions)		221.2	220.2	221	220
Weighted Average Common Shares - Diluted (in millions)		222.3	221.4	222.2	221.2
[1]	Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding.

Consolidated Comprehensive Inco

Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 490.4	$ 433.5	$ 979.3	$ 790.5
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	(398.2)	51.3	(134.2)	(16.8)
Net gain (loss) on derivatives, net of tax	(27.4)		(5.3)
Net gain (loss) on derivatives, net of tax		(35.4)		(45.7)
Pension and postretirement benefits, net of tax			0	(3.9)
Reclassification adjustments:
Derivatives, net of tax	(17)		(20.6)
Derivatives, net of tax		36.9		33.8
Pension and postretirement benefits, net of tax	21.2	18.7	40.9	33.9
Total Other Comprehensive Income (Loss)	(421.4)	71.5	(119.2)	1.3
Comprehensive Income	69	505	860.1	791.8
Net Income Attributable to Noncontrolling Interests	12.6	12.2	25.9	21.7
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	(31.8)	5.1	(16.6)	4.2
Comprehensive Income Attributable to Air Products	$ 88.2	$ 487.7	$ 850.8	$ 765.9

Consolidated Comprehensive In_2

Consolidated Comprehensive Income Statements (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Tax effect on translation adjustments	$ 11.3	$ 8	$ 0.5	$ 12.9
Tax effect on net gain (loss) on derivatives	6		8.6
Tax effect on net gain (loss) on derivatives		(8.7)		(9.4)
Tax effect on pension and postretirement benefits	0	0	0	(0.8)
Tax effect on derivatives reclassification adjustments	(5)		(5.8)
Tax effect on derivatives reclassification adjustments		11.5		10.7
Tax effect on pension and postretirement benefits reclassification adjustments	$ 6.5	$ 6	$ 13	$ 11

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Current Assets
Cash and cash items	$ 2,220.1	$ 2,248.7
Short-term investments	0	166
Trade receivables, net	1,399.4	1,260.2
Inventories	399.7	388.3
Prepaid expenses	129.6	77.4
Other receivables and current assets	539.7	477.7
Total Current Assets	4,688.5	4,618.3
Investment in net assets of and advances to equity affiliates	1,314.6	1,276.2
Plant and equipment, at cost	23,005.2	22,333.7
Less: accumulated depreciation	12,381.5	11,996.1
Plant and equipment, net	10,623.7	10,337.6
Goodwill, net	785.3	797.1
Intangible assets, net	377.9	419.5
Noncurrent lease receivables	840.8
Noncurrent lease receivables		890
Other noncurrent assets	870.4	604.1
Total Noncurrent Assets	14,812.7	14,324.5
Total Assets	19,501.2	18,942.8
Current Liabilities
Payables and accrued liabilities	1,649.1	1,635.7
Accrued income taxes	90.4	86.6
Short-term borrowings	29	58.2
Current portion of long-term debt	38.4	40.4
Total Current Liabilities	1,806.9	1,820.9
Long-term debt	2,922.1	2,907.3
Long-term debt – related party	323.1	320.1
Other noncurrent liabilities	1,881	1,712.4
Deferred income taxes	844.4	793.8
Total Noncurrent Liabilities	5,970.6	5,733.6
Total Liabilities	7,777.5	7,554.5
Commitments and Contingencies - See Note 13
Air Products Shareholders’ Equity
Common stock	249.4	249.4
Capital in excess of par value	1,074.6	1,070.9
Retained earnings	14,537.2	14,138.4
Accumulated other comprehensive loss	(2,478.2)	(2,375.6)
Treasury stock, at cost	(2,011.1)	(2,029.5)
Total Air Products Shareholders’ Equity	11,371.9	11,053.6
Noncontrolling Interests	351.8	334.7
Total Equity	11,723.7	11,388.3
Total Liabilities and Equity	$ 19,501.2	$ 18,942.8

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2020	Sep. 30, 2019
Air Products Shareholders’ Equity
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, issued shares	249,455,584	249,455,584
Treasury stock at cost, shares	28,600,937	29,040,322

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net Income	$ 979.3	$ 790.5
Less: Net income attributable to noncontrolling interests of continuing operations	25.9	21.7
Net income attributable to Air Products	953.4	768.8
Loss from discontinued operations	14.3	0
Income from continuing operations attributable to Air Products	967.7	768.8
Adjustments to reconcile income to cash provided by operating activities:
Depreciation and amortization	583.9	520.1
Deferred income taxes	55	27.5
Tax reform repatriation	0	46.2
Facility closure	0	29
Undistributed (earnings) losses of unconsolidated affiliates	(101.6)	(27.2)
Gain on sale of assets and investments	(40.5)	(2.3)
Share-based compensation	26.9	21.2
Noncurrent lease receivables	47.1	47.6
Other adjustments	54	(3.5)
Working capital changes that provided (used) cash, excluding effects of acquisitions:
Trade receivables	(111.9)	(55.4)
Inventories	(16.5)	(14.2)
Other receivables	(0.7)	49.6
Payables and accrued liabilities	(111.8)	(125.5)
Other working capital	(113.1)	3.9
Cash Provided by Operating Activities	1,238.5	1,285.8
Investing Activities
Additions to plant and equipment	(930.6)	(963.5)
Acquisitions, less cash acquired	0	(106.3)
Investment in and advances to unconsolidated affiliates	(22.7)	(1.4)
Proceeds from sale of assets and investments	68	3.8
Purchases of investments	0	(5.3)
Proceeds from investments	177	187.9
Other investing activities	1.9	2.7
Cash Used for Investing Activities	(706.4)	(882.1)
Financing Activities
Payments on long-term debt	(3.4)	(2.7)
Net decrease in commercial paper and short-term borrowings	(33.3)	(6.6)
Dividends paid to shareholders	(511.7)	(483.1)
Proceeds from stock option exercises	20.2	45.4
Other financing activities	(9.6)	(12.8)
Cash Used for Financing Activities	(537.8)	(459.8)
Effect of Exchange Rate Changes on Cash	(22.9)	0.7
Decrease in cash and cash items	(28.6)	(55.4)
Cash and Cash items – Beginning of Year	2,248.7	2,791.3
Cash and Cash Items – End of Period	$ 2,220.1	$ 2,735.9

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Air Products Shareholders' Equity	Non-controlling Interests
Beginning balance at Sep. 30, 2018	$ 11,176.3	$ 249.4	$ 1,029.3	$ 13,409.9	$ (1,741.9)	$ (2,089.2)	$ 10,857.5	$ 318.8
Stockholders' Equity [Roll Forward]
Net income	790.5			768.8			768.8	21.7
Other comprehensive income (loss)	1.3				(2.9)		(2.9)	4.2
Dividends on common stock	(497.5)			(497.5)			(497.5)
Dividends to noncontrolling interests	(7)							(7)
Share-based compensation	20.7		20.7				20.7
Issuance of treasury shares for stock option and award plans	39.7		(0.9)			40.6	39.7
Cumulative change in accounting principle	(17.1)			(17.1)			(17.1)
Other equity transactions	(3.5)		(1.4)	(2.1)			(3.5)
Ending balance at Mar. 31, 2019	11,503.4	249.4	1,047.7	13,662	(1,744.8)	(2,048.6)	11,165.7	337.7
Beginning balance at Dec. 31, 2018	11,203.4	249.4	1,030.4	13,497.9	(1,811.2)	(2,083.6)	10,882.9	320.5
Stockholders' Equity [Roll Forward]
Net income	433.5			421.3			421.3	12.2
Other comprehensive income (loss)	71.5				66.4		66.4	5.1
Dividends on common stock	(255.9)			(255.9)			(255.9)
Dividends to noncontrolling interests	(0.1)							(0.1)
Share-based compensation	11.8		11.8				11.8
Issuance of treasury shares for stock option and award plans	41.7		6.7			35	41.7
Other equity transactions	(2.5)		(1.2)	(1.3)			(2.5)
Ending balance at Mar. 31, 2019	11,503.4	249.4	1,047.7	13,662	(1,744.8)	(2,048.6)	11,165.7	337.7
Beginning balance at Sep. 30, 2019	11,388.3	249.4	1,070.9	14,138.4	(2,375.6)	(2,029.5)	11,053.6	334.7
Stockholders' Equity [Roll Forward]
Net income	979.3			953.4			953.4	25.9
Other comprehensive income (loss)	(119.2)				(102.6)		(102.6)	(16.6)
Dividends on common stock	(551.9)			(551.9)			(551.9)
Dividends to noncontrolling interests	(4.4)							(4.4)
Share-based compensation	24.6		24.6				24.6
Issuance of treasury shares for stock option and award plans	2.2		(16.2)			18.4	2.2
Investments by noncontrolling interests	11.9							11.9
Other equity transactions	(7.1)		(4.7)	(2.7)			(7.4)	0.3
Ending balance at Mar. 31, 2020	11,723.7	249.4	1,074.6	14,537.2	(2,478.2)	(2,011.1)	11,371.9	351.8
Beginning balance at Dec. 31, 2019	11,929.8	249.4	1,061.7	14,356.9	(2,088.6)	(2,023.4)	11,556	373.8
Stockholders' Equity [Roll Forward]
Net income	490.4			477.8			477.8	12.6
Other comprehensive income (loss)	(421.4)				(389.6)		(389.6)	(31.8)
Dividends on common stock	(295.9)			(295.9)			(295.9)
Dividends to noncontrolling interests	(3.1)							(3.1)
Share-based compensation	10.7		10.7				10.7
Issuance of treasury shares for stock option and award plans	14.6		2.3			12.3	14.6
Other equity transactions	(1.4)		(0.1)	(1.6)			(1.7)	0.3
Ending balance at Mar. 31, 2020	$ 11,723.7	$ 249.4	$ 1,074.6	$ 14,537.2	$ (2,478.2)	$ (2,011.1)	$ 11,371.9	$ 351.8

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Dividends per share (in dollars per share)	$ 1.34	$ 1.16	$ 2.50	$ 2.26

Basis of Presentation and Major

Basis of Presentation and Major Accounting Policies	6 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation and Major Accounting Policies	BASIS OF PRESENTATION AND MAJOR ACCOUNTING POLICIES The interim consolidated financial statements of Air Products and Chemicals, Inc. and its subsidiaries (“we,” “our,” “us,” the “Company,” “Air Products,” or “registrant”) included herein have been prepared by us, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles ("GAAP") have been condensed or omitted pursuant to such rules and regulations. In our opinion, the accompanying statements reflect adjustments necessary to present fairly the financial position, results of operations, and cash flows for those periods indicated and contain adequate disclosures to make the information presented not misleading. Adjustments included herein are of a normal, recurring nature unless otherwise disclosed in the notes. The notes to the interim consolidated financial statements, unless otherwise indicated, are on a continuing operations basis. To fully understand the basis of presentation, the consolidated financial statements and related notes included herein should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended 30 September 2019 ( the " 2019 Form 10-K"). Results of operations for interim periods are not necessarily indicative of the results of operations for a full year. Refer to our 2019 Form 10-K for a description of major accounting policies. In fiscal year 2020, these policies were impacted by the implementation of certain new accounting guidance, including the adoption of Accounting Standards Codification ("ASC") Topic 842, Leases , and all related amendments (the "new lease standard”). We adopted the new lease standard as of 1 October 2019 under the modified retrospective approach. Comparative prior year information has not been restated and continues to be reported under the accounting standards in effect for those periods. Our updated lease policy is discussed below. Other than the adoption of new accounting guidance as discussed in Note 2 , New Accounting Guidance , and presentation changes discussed below, there were no notable changes to our accounting policies during the first six months of fiscal year 2020 . Leases As lessee, we recognize a right-of-use ("ROU") asset and lease liability on the balance sheet for all leases with a term in excess of 12 months. We determine if an arrangement contains a lease at inception. The arrangement contains a lease when there is an identifiable asset, we obtain substantially all of the economic benefits from that asset, and we direct how and for what purpose the asset is used during the term of the arrangement. If the initial term of an arrangement is 12 months or less, we have made an accounting election to not assess if these arrangements contain a lease for inclusion on our balance sheet. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Since our leases generally do not provide an implicit discount rate, we use our incremental borrowing rates based on the information available at the commencement date in determining the present value of lease payments. To determine the incremental borrowing rate, we consider our unsecured borrowings and published market rates, and then adjust those rates to assume full collateralization and to factor in the individual lease term, geography, and payment structure. Our lease term includes periods covered by options to extend or terminate the lease when it is reasonably certain that we will exercise an option to extend or not exercise an option to terminate. Lease payments consider our practical expedient to combine amounts for lease and related non-lease components for all classes of underlying assets in which we are lessee. Fixed payments and payments associated with escalation clauses based on an index are included in the ROU asset and lease liability at commencement. Variable lease payments are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. Our variable lease payments primarily include the impact from escalation clauses that are not fixed or based on an index. Prepaid lease payments are included in the recognition of ROU assets. Our lease agreements do not contain any material lease incentives, residual value guarantees or restrictions or covenants. Foreign Currency As further discussed in Note 2 , New Accounting Guidance , we adopted new accounting guidance on hedging activities in fiscal year 2020 that changed the income statement presentation of excluded components (foreign currency forward points and currency swap basis differences) of our cash flow hedges of intercompany loans. This activity is now amortized on a straight-line basis within “Other non-operating income (expense), net" instead of being recognized in "Interest expense." In addition, gains and losses from the foreign currency remeasurement of balances associated with intercompany and third-party financing transactions, related income tax assets and liabilities, and the impact of related hedges are now also reflected within “Other non-operating income (expense), net.” All other gains and losses from foreign currency transactions continue to be reflected within "Other income (expense), net" on our consolidated income statements. Comparative prior year information has not been restated. COVID-19 Risks and Uncertainties In March 2020, the World Health Organization declared the novel strain of coronavirus ("COVID-19") a global pandemic and recommended containment and mitigation measures worldwide. The Company is monitoring this, and although operations have not been materially affected by the COVID-19 outbreak as of and for the three and six months ended 31 March 2020, we are unable to predict the impact that COVID-19 will have on our future financial position and operating results due to numerous uncertainties. The duration and severity of the outbreak and its long-term impact on our business are uncertain at this time.

New Accounting Guidance

New Accounting Guidance	6 Months Ended
	Mar. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Guidance	NEW ACCOUNTING GUIDANCE Accounting Guidance Implemented in Fiscal Year 2020 Leases In February 2016, the FASB issued lease guidance (the "new lease guidance") that requires lessees to recognize a right-of-use asset and lease liability on the balance sheet for all leases, including operating leases, with a term in excess of 12 months. The guidance also expands the quantitative and qualitative disclosure requirements. The Company is the lessee under various agreements for real estate, vehicles, aircraft, and other equipment that are accounted for as operating leases. We adopted this guidance in fiscal year 2020 using a modified retrospective approach with the election to apply the guidance as of 1 October 2019, "the adoption date," instead of the earliest comparative period presented in the consolidated financial statements. We elected the following practical expedients provided by this guidance: • The package of practical expedients, which allows us to carry forward the lease population and classification existing as of the adoption date, among other things; • The land easements practical expedient, which allows us to carry forward our accounting treatment for land easements on agreements existing before the adoption date; • The hindsight practical expedient, which is used to determine the reasonably certain lease term for existing leases as of the adoption date; • The component combination practical expedient, which allows us to account for lease and non-lease components associated with that lease as a single component, if certain criteria are met; and • The short-term leases practical expedient, which allows us to not record the related lease liabilities and right-of-use assets for operating leases in which we are the lessee with a term of 12 months or less. Adoption of the standard resulted in recognition of lease liabilities and right-of-use assets on our consolidated balance sheets of $375.3 and $332.3 , respectively. The standard did not materially affect our retained earnings, results of operations or liquidity. Refer to Note 9 , Leases , for additional information. Hedging Activities In August 2017, the FASB issued guidance on hedging activities to expand the related presentation and disclosure requirements, change how companies assess effectiveness, and eliminate the separate measurement and reporting of hedge ineffectiveness. The guidance also enables more hedging strategies to become eligible for hedge accounting. We adopted the new guidance on 1 October 2019 on a modified retrospective basis. The primary impact of adoption was the presentation in the consolidated income statement of foreign currency forward points and currency swap basis differences ("excluded components"), since these are excluded from the assessment of hedge effectiveness for our hedges of intercompany loans. Historically, the impacts from changes in value of these components were recorded in "Interest expense." Beginning in fiscal year 2020, the excluded components were recognized in "Other non-operating income (expense), net" consistent with the remeasurement of the intercompany loans. During the three and six months ended 31 March 2020, we recognized $8.5 and $17.4 , respectively, in "Other non-operating income (expense), net.” During the three and six months ended 31 March 2019, we recognized $9.1 and $17.4 , respectively, in “Interest expense.” In accordance with the transition provisions of the guidance, the separate measurement of ineffectiveness for our cash flow hedging instruments existing as of the date of adoption should be eliminated through a cumulative-effect adjustment within equity. Ineffectiveness recognized for our cash flow hedging instruments existing as of the date of adoption was not material to the consolidated financial statements. New Accounting Guidance to be Implemented Credit Losses on Financial Instruments In June 2016, the FASB issued guidance on the measurement of credit losses, which requires measurement and recognition of expected credit losses for financial assets, including trade receivables and capital lease receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The method to determine a loss is different from the existing guidance, which requires a credit loss to be recognized when it is probable. The guidance is effective beginning in fiscal year 2021, with early adoption permitted beginning in fiscal year 2020. We are currently evaluating the impact this guidance will have on our consolidated financial statements. Fair Value Measurement Disclosures In August 2018, the FASB issued guidance which modifies the disclosure requirements for fair value measurements. The guidance is effective in fiscal year 2021, with early adoption permitted. Certain amendments must be applied prospectively and other amendments retrospectively. We are currently evaluating the impact this guidance will have on disclosures in the notes to our consolidated financial statements. Retirement Benefit Disclosures In August 2018, the FASB issued guidance which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The guidance is effective in fiscal year 2021, with early adoption permitted, and must be applied on a retrospective basis. We expect to adopt this guidance in the fourth quarter of fiscal year 2020 and update the disclosures contained in our annual report on Form 10-K accordingly. Other than the modification of certain disclosures, this guidance will have no effect on our consolidated financial statements. Cloud Computing Implementation Costs In August 2018, the FASB issued guidance which aligns the capitalization requirements for implementation costs incurred in a hosting arrangement that is a service contract with the existing capitalization requirements for implementation costs incurred to develop or obtain internal-use software. The guidance is effective in fiscal year 2021, with early adoption permitted, and may be applied either prospectively or retrospectively. We are currently evaluating the impact this guidance will have on our consolidated financial statements. Related Party Guidance for Variable Interest Entities In October 2018, the FASB issued an update which amends the guidance for determining whether a decision-making fee is a variable interest. The amendments require consideration of indirect interests held through related parties under common control on a proportional basis rather than as the equivalent of a direct interest in its entirety as currently required. The guidance is effective in fiscal year 2021, with early adoption permitted. The amendments must be applied retrospectively with a cumulative-effect adjustment to retained earnings at the beginning of the earliest period presented. We are currently evaluating the impact this guidance will have on our consolidated financial statements. Simplifying the Accounting for Income Taxes In December 2019, the FASB issued an update to simplify the accounting for income taxes and improve consistent application by clarifying or amending existing guidance. This guidance is effective in fiscal year 2022, with early adoption permitted. Depending on the provision, application can be made on a prospective, retrospective, or on a modified retrospective basis. We do not expect this guidance to have a material impact on our consolidated financial statements upon adoption. Reference Rate Reform In March 2020, the FASB issued an update to provide practical expedients and exception for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. This update is primarily applicable to our contracts and hedging relationships that reference LIBOR. The amendments may be applied to impacted contracts and hedges prospectively through 31 December 2022. We are currently evaluating the impact this guidance will have on our consolidated financial statements.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	REVENUE RECOGNITION The majority of the Company's revenue is generated from its sale of gas customers within its Industrial Gases regional segments. We distribute gases through either our on-site or merchant supply mode depending on various factors, including the customer's volume requirements and location. The Industrial Gases – Global and the Corporate and other segments serve our sale of equipment customers. Disaggregation of Revenue The tables below present our consolidated sales disaggregated by supply mode for each of our reporting segments for the three and six months ended 31 March 2020 and 2019 . We believe this presentation best depicts the nature, timing, type of customer, and contract terms for our sales. Industrial Industrial Industrial Industrial Corporate Total % Three Months Ended 31 March 2020 On-site $516.2 $160.3 $425.6 $— $— $1,102.1 50 % Merchant 416.2 332.4 232.5 — — 981.1 44 % Sale of Equipment — — — 79.3 53.8 133.1 6 % Total $932.4 $492.7 $658.1 $79.3 $53.8 $2,216.3 100 % Three Months Ended 31 March 2019 On-site $580.9 $178.6 $386.0 $— $— $1,145.5 52 % Merchant 410.8 315.8 239.4 — — 966.0 44 % Sale of Equipment — — — 53.8 22.4 76.2 4 % Total $991.7 $494.4 $625.4 $53.8 $22.4 $2,187.7 100 % Industrial Industrial Industrial Industrial Corporate Total % Six Months Ended 31 March 2020 On-site $1,050.7 $331.7 $843.9 $— $— $2,226.3 50 % Merchant 817.9 659.7 507.0 — — 1,984.6 44 % Sale of Equipment — — — 171.9 88.2 260.1 6 % Total $1,868.6 $991.4 $1,350.9 $171.9 $88.2 $4,471.0 100 % Six Months Ended 31 March 2019 On-site $1,176.9 $400.8 $767.0 $— $— $2,344.7 53 % Merchant 804.0 617.8 485.2 — — 1,907.0 43 % Sale of Equipment — — — 122.0 38.0 160.0 4 % Total $1,980.9 $1,018.6 $1,252.2 $122.0 $38.0 $4,411.7 100 % Remaining Performance Obligations As of 31 March 2020 , the transaction price allocated to remaining performance obligations is estimated to be approximately $20 billion . This amount includes fixed-charge contract provisions associated with our on-site and sale of equipment supply modes. We estimate that approximately half of this revenue will be recognized over approximately the next five years and the balance thereafter. Expected revenue associated with new on-site plants that are not yet onstream is excluded from this amount. In addition, this amount excludes consideration associated with contracts having an expected duration of less than one year and variable consideration for which we recognize revenue at the amount to which we have the right to invoice, including pass-through costs related to energy and natural gas. In the future, actual amounts will differ due to events outside of our control, including but not limited to inflationary price escalations, currency exchange rates, and terminated or renewed contracts. Contract Balances The table below details balances arising from contracts with customers: Balance Sheet Location 31 March 2020 30 September 2019 Assets Contract assets – current Other receivables and current assets $84.2 $64.3 Contract fulfillment costs – current Other receivables and current assets 84.8 64.5 Liabilities Contract liabilities – current Payables and accrued liabilities 284.1 247.4 Contract liabilities – noncurrent Other noncurrent liabilities 51.2 49.2 Changes to our contract balances primarily relate to our sale of equipment contracts. During the six months ended 31 March 2020 , we recognized approximately $95 in revenue associated with sale of equipment contracts that was included within our contract liabilities as of 30 September 2019.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Mar. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS Our consolidated income statements for the three and six months ended 31 March 2020 include a pre-tax loss from discontinued operations of $19.0 ( $14.3 after-tax). We recorded this loss to increase our existing liability for retained environmental obligations associated with the sale of our former Amines business in September 2006. Refer to the Pace discussion within Note 13 , Commitments and Contingencies , for additional information. The loss did not have an impact on our statement of cash flows for the six months ended March 31, 2020.

Cost Reduction Actions

Cost Reduction Actions	6 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Cost Reduction Actions	COST REDUCTION ACTIONS In fiscal year 2019, we recognized an expense of $25.5 for severance and other benefits associated with the elimination or planned elimination of approximately 300 positions. These actions were taken to drive cost synergies primarily within the Industrial Gases – EMEA and the Industrial Gases – Americas segments. The charge was not recorded in segment results. Liabilities associated with these actions are reflected on our consolidated balance sheets within "Payables and accrued liabilities." The table below summarizes the carrying amount of the accrual as of 31 March 2020 : 2019 Charge $25.5 Cash expenditures (6.9 ) Amount reflected in pension liability (0.3 ) Currency translation adjustment (0.5 ) 30 September 2019 $17.8 Cash expenditures (7.8 ) Currency translation adjustment 0.2 31 March 2020 $10.2

Acquisitions

Acquisitions	6 Months Ended
	Mar. 31, 2020
Acquisitions [Abstract]
Acquisitions	ACQUISITIONS During the second quarter of fiscal year 2019, we acquired ACP Europe SA, the largest independent carbon dioxide business in Continental Europe, for an aggregate purchase price, net of cash acquired, of $106.3 . The results of this business are consolidated within our Industrial Gases – EMEA segment. Subsequent Event On 17 April 2020, Air Products acquired five operating hydrogen production plants from PBF Energy Inc. for $530 and has commenced the long-term supply of hydrogen from those plants to PBF refineries.

Inventories

Inventories	6 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Inventories	INVENTORIES The components of inventories are as follows: 31 March 30 September 2020 2019 Finished goods $131.2 $128.8 Work in process 28.5 27.5 Raw materials, supplies and other 240.0 232.0 Inventories $399.7 $388.3

Goodwill

Goodwill	6 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL Changes to the carrying amount of consolidated goodwill by segment for the six months ended 31 March 2020 are as follows: Industrial Gases– Americas Industrial Gases– EMEA Industrial Gases– Asia Industrial Gases– Global Corporate and other Total Goodwill, net at 30 September 2019 $156.3 $432.3 $178.5 $19.6 $10.4 $797.1 Currency translation and other (7.8 ) (2.0 ) (1.5 ) (0.5 ) — (11.8 ) Goodwill, net at 31 March 2020 $148.5 $430.3 $177.0 $19.1 $10.4 $785.3 31 March 30 September 2020 2019 Goodwill, gross $1,095.9 $1,162.2 Accumulated impairment losses (A) (310.6 ) (365.1 ) Goodwill, net $785.3 $797.1 (A) Accumulated impairment losses include the impacts of currency translation. These losses are attributable to our Latin America reporting unit ("LASA") within the Industrial Gases – Americas segment. We review goodwill for impairment annually in the fourth quarter of the fiscal year and whenever events or changes in circumstances indicate that the carrying value of goodwill might not be recoverable.

Leases

Leases	6 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Leases	LEASES As discussed in Note 2 , New Accounting Guidance , we adopted the new lease guidance in fiscal year 2020 using a modified retrospective approach with the election to apply the guidance as of 1 October 2019. For adoption, we elected the package of practical expedients permitted under the transition guidance to carry forward the historical lease populations as well as their classifications existing as of the adoption date (i.e. contracts having a lease commencement date prior to 1 October 2019). Refer to Note 1 , Basis of Presentation and Major Accounting Policies , and Note 2 , New Accounting Guidance , for additional information on our adoption and related policies under the new lease standard. Lessee Accounting The Company is the lessee under various agreements for real estate, vehicles, aircraft, and other equipment that are accounted for as operating leases. Our finance leases principally relate to the right to use machinery and equipment and are not material. The operating lease expense for the three and six months ended 31 March 2020 , which exclude short-term and variable lease expenses, as those expenses are immaterial, was $20.1 and $39.5 , respectively. Amounts associated with operating leases, including their presentation on our consolidated balance sheets, as of our most recent balance sheet date and our adoption date are as follows: 31 March 2020 1 October 2019 Operating lease ROU asset Other noncurrent assets $351.1 $332.3 Operating lease liabilities Payables and accrued liabilities 67.2 68.6 Other noncurrent liabilities 326.2 306.7 Total Operating Lease Liabilities $393.4 $375.3 The difference between the ROU assets and lease liabilities recorded upon adoption primarily relate to the land lease associated with our former Energy-from-Waste business in which an ROU asset was not recognized. 31 March 2020 Weighted-average remaining lease term (in years) (A) 15.4 Weighted-average discount rate (B) 2.2 % (A) Calculated on the basis of the remaining lease term and the lease liability balance for each lease as of the reporting date. (B) Calculated on the basis of the discount rate used to calculate the lease liability for each lease as of the reporting date and the remaining balance of the lease payments for each lease as of the reporting date. At 31 March 2020 , the maturity analysis of lease liabilities, showing the undiscounted cash flows, is as follows: Operating Leases 2020 (excluding the six months ended 31 March 2020) $39.2 2021 66.4 2022 48.3 2023 40.6 2024 33.2 Thereafter 232.0 Total Undiscounted Lease Payments $459.7 Imputed interest (66.3 ) Present Value of Lease Liability Recognized on the Balance Sheet $393.4 As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum payments due under leases were as follows: Operating 2020 $75.1 2021 62.6 2022 44.4 2023 35.9 2024 28.6 Thereafter 171.4 Total Undiscounted Lease Payments $418.0 The impacts associated with our operating leases on the consolidated statements of cash flows are reflected within "Other adjustments" within operating activities. This includes the non-cash impact from operating lease costs of $39.5 as well as a use of cash of $39.1 for payments on amounts included in the measurement of the lease liability. The net impact to operating cash flows from these activities is not material. In addition to the ROU assets established upon adoption, we recorded $70 of non-cash additions during the six months ended 31 March 2020 . Lessor Accounting Historically, certain contracts associated with facilities that are built to provide product to a specific customer were accounted for as leases. As noted above, we elected the package of practical expedients permitted under the transition guidance to carry forward these lease determinations as of 30 September 2019. In cases where operating lease treatment is appropriate, there is no difference in revenue recognition over the life of the contract as compared to accounting for the contract under a sale of gas agreement. Under the new lease standard, these contracts qualify for a practical expedient available to lessors to combine the lease and non-lease components and account for the combined component in accordance with the accounting treatment for the predominant component. We elected to apply this practical expedient and have accounted for the combined component as product sales under the revenue standard as we control the operations and maintenance of the assets that provide the supply of gas to our customers. In cases where sales-type lease treatment is appropriate, revenue and expense are recognized up front for the sale of equipment component of the contract as compared to revenue recognition over the life of the arrangement under contracts not qualifying as sales-type leases. Additionally, a portion of the revenue representing interest income from the financing component of the lease receivable is reflected as sales over the life of the contract. During the six months ended 31 March 2020 , we recognized interest income of $36.4 on our lease receivables. As we generally control the operations and maintenance of the assets that provide the supply of gas to our customers, we do not expect new arrangements to qualify as leases. Our contracts generally do not have the option to extend or terminate the lease or provide the customer the right to purchase the asset at the end of the contract term. Instead, renewal of such contracts requires negotiation of mutually agreed terms by both parties. Unless the customer terminates within the required notice period, the contract will go into evergreen. Given the long-term duration of our contracts, there is no assumed residual value for the assets at the end of the lease term. Lease receivables, net, primarily relate to sales-type leases and are mostly included within "Noncurrent lease receivables" on our consolidated balance sheets, with the remaining balance in "Other receivables and current assets." Lease payments collected during the six months ended 31 March 2020 were $83.5 . These payments reduced the lease receivable balance by $47.1 in fiscal year 2020 . At 31 March 2020 , minimum lease payments expected to be collected, which reconciles to the total undiscounted minimum lease payments reflected in the table below, were as follows: 2020 (excluding the six months ended 31 March 2020) $79.7 2021 155.4 2022 144.7 2023 138.6 2024 132.6 Thereafter 715.7 Total $1,366.7 Unearned interest income (436.1 ) Lease Receivables, net $930.6 As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum lease payments expected to be collected were as follows: 2020 $162.5 2021 156.9 2022 145.7 2023 139.4 2024 133.2 Thereafter 715.5 Total $1,453.2 Unearned interest income (472.3 ) Lease Receivables, net $980.9 Other than lease payments received during the first six
Leases	LEASES As discussed in Note 2 , New Accounting Guidance , we adopted the new lease guidance in fiscal year 2020 using a modified retrospective approach with the election to apply the guidance as of 1 October 2019. For adoption, we elected the package of practical expedients permitted under the transition guidance to carry forward the historical lease populations as well as their classifications existing as of the adoption date (i.e. contracts having a lease commencement date prior to 1 October 2019). Refer to Note 1 , Basis of Presentation and Major Accounting Policies , and Note 2 , New Accounting Guidance , for additional information on our adoption and related policies under the new lease standard. Lessee Accounting The Company is the lessee under various agreements for real estate, vehicles, aircraft, and other equipment that are accounted for as operating leases. Our finance leases principally relate to the right to use machinery and equipment and are not material. The operating lease expense for the three and six months ended 31 March 2020 , which exclude short-term and variable lease expenses, as those expenses are immaterial, was $20.1 and $39.5 , respectively. Amounts associated with operating leases, including their presentation on our consolidated balance sheets, as of our most recent balance sheet date and our adoption date are as follows: 31 March 2020 1 October 2019 Operating lease ROU asset Other noncurrent assets $351.1 $332.3 Operating lease liabilities Payables and accrued liabilities 67.2 68.6 Other noncurrent liabilities 326.2 306.7 Total Operating Lease Liabilities $393.4 $375.3 The difference between the ROU assets and lease liabilities recorded upon adoption primarily relate to the land lease associated with our former Energy-from-Waste business in which an ROU asset was not recognized. 31 March 2020 Weighted-average remaining lease term (in years) (A) 15.4 Weighted-average discount rate (B) 2.2 % (A) Calculated on the basis of the remaining lease term and the lease liability balance for each lease as of the reporting date. (B) Calculated on the basis of the discount rate used to calculate the lease liability for each lease as of the reporting date and the remaining balance of the lease payments for each lease as of the reporting date. At 31 March 2020 , the maturity analysis of lease liabilities, showing the undiscounted cash flows, is as follows: Operating Leases 2020 (excluding the six months ended 31 March 2020) $39.2 2021 66.4 2022 48.3 2023 40.6 2024 33.2 Thereafter 232.0 Total Undiscounted Lease Payments $459.7 Imputed interest (66.3 ) Present Value of Lease Liability Recognized on the Balance Sheet $393.4 As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum payments due under leases were as follows: Operating 2020 $75.1 2021 62.6 2022 44.4 2023 35.9 2024 28.6 Thereafter 171.4 Total Undiscounted Lease Payments $418.0 The impacts associated with our operating leases on the consolidated statements of cash flows are reflected within "Other adjustments" within operating activities. This includes the non-cash impact from operating lease costs of $39.5 as well as a use of cash of $39.1 for payments on amounts included in the measurement of the lease liability. The net impact to operating cash flows from these activities is not material. In addition to the ROU assets established upon adoption, we recorded $70 of non-cash additions during the six months ended 31 March 2020 . Lessor Accounting Historically, certain contracts associated with facilities that are built to provide product to a specific customer were accounted for as leases. As noted above, we elected the package of practical expedients permitted under the transition guidance to carry forward these lease determinations as of 30 September 2019. In cases where operating lease treatment is appropriate, there is no difference in revenue recognition over the life of the contract as compared to accounting for the contract under a sale of gas agreement. Under the new lease standard, these contracts qualify for a practical expedient available to lessors to combine the lease and non-lease components and account for the combined component in accordance with the accounting treatment for the predominant component. We elected to apply this practical expedient and have accounted for the combined component as product sales under the revenue standard as we control the operations and maintenance of the assets that provide the supply of gas to our customers. In cases where sales-type lease treatment is appropriate, revenue and expense are recognized up front for the sale of equipment component of the contract as compared to revenue recognition over the life of the arrangement under contracts not qualifying as sales-type leases. Additionally, a portion of the revenue representing interest income from the financing component of the lease receivable is reflected as sales over the life of the contract. During the six months ended 31 March 2020 , we recognized interest income of $36.4 on our lease receivables. As we generally control the operations and maintenance of the assets that provide the supply of gas to our customers, we do not expect new arrangements to qualify as leases. Our contracts generally do not have the option to extend or terminate the lease or provide the customer the right to purchase the asset at the end of the contract term. Instead, renewal of such contracts requires negotiation of mutually agreed terms by both parties. Unless the customer terminates within the required notice period, the contract will go into evergreen. Given the long-term duration of our contracts, there is no assumed residual value for the assets at the end of the lease term. Lease receivables, net, primarily relate to sales-type leases and are mostly included within "Noncurrent lease receivables" on our consolidated balance sheets, with the remaining balance in "Other receivables and current assets." Lease payments collected during the six months ended 31 March 2020 were $83.5 . These payments reduced the lease receivable balance by $47.1 in fiscal year 2020 . At 31 March 2020 , minimum lease payments expected to be collected, which reconciles to the total undiscounted minimum lease payments reflected in the table below, were as follows: 2020 (excluding the six months ended 31 March 2020) $79.7 2021 155.4 2022 144.7 2023 138.6 2024 132.6 Thereafter 715.7 Total $1,366.7 Unearned interest income (436.1 ) Lease Receivables, net $930.6 As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum lease payments expected to be collected were as follows: 2020 $162.5 2021 156.9 2022 145.7 2023 139.4 2024 133.2 Thereafter 715.5 Total $1,453.2 Unearned interest income (472.3 ) Lease Receivables, net $980.9 Other than lease payments received during the first six

Financial Instruments

Financial Instruments	6 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	FINANCIAL INSTRUMENTS Currency Price Risk Management Our earnings, cash flows, and financial position are exposed to foreign currency risk from foreign currency-denominated transactions and net investments in foreign operations. It is our policy to seek to minimize our cash flow volatility from changes in currency exchange rates. This is accomplished by identifying and evaluating the risk that our cash flows will change in value due to changes in exchange rates and by executing strategies necessary to manage such exposures. Our objective is to maintain economically balanced currency risk management strategies that provide adequate downside protection. Forward Exchange Contracts We enter into forward exchange contracts to reduce the cash flow exposure to foreign currency fluctuations associated with highly anticipated cash flows and certain firm commitments, such as the purchase of plant and equipment. We also enter into forward exchange contracts to hedge the cash flow exposure on intercompany loans. This portfolio of forward exchange contracts consists primarily of Euros and U.S. Dollars. The maximum remaining term of any forward exchange contract currently outstanding and designated as a cash flow hedge at 31 March 2020 is 3.2 years . Forward exchange contracts are also used to hedge the value of investments in certain foreign subsidiaries and affiliates by creating a liability in a currency in which we have a net equity position. The primary currency pair in this portfolio of forward exchange contracts is Euros and U.S. Dollars. We also utilize forward exchange contracts that are not designated as hedges. These contracts are used to economically hedge foreign currency-denominated monetary assets and liabilities, primarily working capital. The primary objective of these forward exchange contracts is to protect the value of foreign currency-denominated monetary assets and liabilities from the effects of volatility in foreign exchange rates that might occur prior to their receipt or settlement. This portfolio of forward exchange contracts consists of many different foreign currency pairs, with a profile that changes from time to time depending on business activity and sourcing decisions. The table below summarizes our outstanding currency price risk management instruments: 31 March 2020 30 September 2019 US$ Notional Years Average Maturity US$ Notional Years Average Maturity Forward Exchange Contracts: Cash flow hedges $2,682.9 0.4 $2,418.2 0.5 Net investment hedges 450.0 1.6 830.8 0.9 Not designated 1,342.3 0.5 1,053.5 0.6 Total Forward Exchange Contracts $4,475.2 0.6 $4,302.5 0.6 We also use foreign currency-denominated debt to hedge the foreign currency exposures of our net investment in certain foreign subsidiaries. The designated foreign currency-denominated debt and related accrued interest was €938.8 million ( $1,036.1 ) at 31 March 2020 and €951.3 million ( $1,036.9 ) at 30 September 2019 . The designated foreign currency-denominated debt is presented within "Long-term debt" on the consolidated balance sheets. Debt Portfolio Management It is our policy to identify, on a continuing basis, the need for debt capital and to evaluate the financial risks inherent in funding the Company with debt capital. Reflecting the result of this ongoing review, our debt portfolio and hedging program are managed with the intent to (1) reduce funding risk with respect to borrowings made by us to preserve our access to debt capital and provide debt capital as required for funding and liquidity purposes, and (2) manage the aggregate interest rate risk and the debt portfolio in accordance with certain debt management parameters. Interest Rate Management Contracts We enter into interest rate swaps to change the fixed/variable interest rate mix of our debt portfolio in order to maintain the percentage of fixed- and variable-rate debt within the parameters set by management. In accordance with these parameters, the agreements are used to manage interest rate risks and costs inherent in our debt portfolio. Our interest rate management portfolio generally consists of fixed-to-floating interest rate swaps (which are designated as fair value hedges), pre-issuance interest rate swaps and treasury locks (which hedge the interest rate risk associated with anticipated fixed-rate debt issuances and are designated as cash flow hedges), and floating-to-fixed interest rate swaps (which are designated as cash flow hedges). As of 31 March 2020 , the outstanding interest rate swaps were denominated in U.S. Dollars. The notional amount of the interest rate swap agreements is equal to or less than the designated debt being hedged. When interest rate swaps are used to hedge variable-rate debt, the indices of the swaps and the debt to which they are designated are the same. It is our policy not to enter into any interest rate management contracts which lever a move in interest rates on a greater than one-to-one basis. Cross Currency Interest Rate Swap Contracts We enter into cross currency interest rate swap contracts when our risk management function deems necessary. These contracts may entail both the exchange of fixed- and floating-rate interest payments periodically over the life of the agreement and the exchange of one currency for another currency at inception and at a specified future date. The contracts are used to hedge either certain net investments in foreign operations or non-functional currency cash flows related to intercompany loans. The current cross currency interest rate swap portfolio consists of fixed-to-fixed swaps primarily between U.S. Dollars and Chinese Renminbi, U.S. Dollars and Indian Rupee, and U.S. Dollars and Chilean Pesos. The following table summarizes our outstanding interest rate management contracts and cross currency interest rate swaps: 31 March 2020 30 September 2019 US$ Notional Average Pay % Average Receive % Years Average Maturity US$ Notional Average Pay % Average Receive % Years Average Maturity Interest rate swaps (fair value hedge) $200.0 LIBOR 2.76 % 1.6 $200.0 LIBOR 2.76 % 2.1 Cross currency interest rate swaps (net investment hedge) $222.9 4.74 % 3.32 % 3.0 $216.8 4.80 % 3.31 % 3.5 Cross currency interest rate swaps (cash flow hedge) $1,063.6 4.83 % 3.07 % 2.0 $1,129.3 4.92 % 3.04 % 2.3 Cross currency interest rate swaps (not designated) $— — % — % 0.0 $6.1 2.55 % 3.72 % 4.5 The table below provides the amounts recorded on the consolidated balance sheet related to cumulative basis adjustments for fair value hedges: Carrying amounts of hedged item Cumulative hedging adjustment, included in carrying amount Balance Sheet Location 31 March 2020 30 September 2019 31 March 2020 30 September 2019 Long-term debt $407.4 $404.7 $7.8 $5.2 The table below summarizes the fair value and balance sheet location of our outstanding derivatives: Balance Sheet Location 31 March 2020 30 September 2019 Balance Sheet Location 31 March 2020 30 September 2019 Derivatives Designated as Hedging Instruments: Forward exchange contracts Other receivables and current assets $90.7 $79.0 Payables and accrued liabilities $40.5 $53.8 Interest rate management contracts Other receivables and current assets 33.7 24.8 Payables and accrued liabilities 0.5 1.1 Forward exchange contracts Other noncurrent assets 16.3 11.9 Other noncurrent liabilities 2.0 0.7 Interest rate management contracts Other noncurrent assets 83.3 60.9 Other noncurrent liabilities — 0.7 Total Derivatives Designated as Hedging Instruments $224.0 $176.6 $43.0 $56.3 Derivatives Not Designated as Hedging Instruments: Forward exchange contracts Other receivables and current assets $40.0 $38.7 Payables and accrued liabilities $19.7 $36.3 Forward exchange contracts Other noncurrent assets 10.2 8.4 Other noncurrent liabilities 21.6 19.8 Interest rate management contracts Other noncurrent assets — 0.5 Other noncurrent liabilities — — Total Derivatives Not Designated as Hedging Instruments $50.2 $47.6 $41.3 $56.1 Total Derivatives $274.2 $224.2 $84.3 $112.4 Refer to Note 11 , Fair Value Measurements , which defines fair value, describes the method for measuring fair value, and provides additional disclosures regarding fair value measurements. The tables below summarize gains (losses) recognized in other comprehensive income during the period related to our net investment and cash flow hedging relationships: Three Months Ended 31 March Six Months Ended 31 March 2020 2019 2020 2019 Net Investment Hedging Relationships Forward exchange contracts $40.5 $8.2 31.4 23.7 Foreign currency debt 16.7 22.7 (13.2 ) 35.3 Cross currency interest rate swaps 12.4 (3.5 ) 8.9 (2.6 ) Total Amount Recognized in OCI 69.6 27.4 27.1 56.4 Tax effects (16.8 ) (6.7 ) (6.6 ) (13.7 ) Net Amount Recognized in OCI $52.8 $20.7 20.5 42.7 Three Months Ended 31 March Six Months Ended 31 March 2020 2019 2020 2019 Derivatives in Cash Flow Hedging Relationships Forward exchange contracts ($10.1 ) ($22.2 ) 16.2 (13.3 ) Forward exchange contracts, excluded components (2.8 ) (3.6 ) (7.3 ) (7.4 ) Other (A) (8.5 ) (18.3 ) (5.6 ) (34.4 ) Total Amount Recognized in OCI (21.4 ) (44.1 ) 3.3 (55.1 ) Tax effects (6.0 ) 8.7 (8.6 ) 9.4 Net Amount Recognized in OCI ($27.4 ) ($35.4 ) (5.3 ) (45.7 ) (A) Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap. Other also includes the recognition of our share of gains and losses, net of tax, related to interest rate swaps held by our equity affiliates. The tables below summarize the location and amounts recognized in income related to our cash flow and fair value hedging relationships by contract type: Three Months Ended 31 March Sales Cost of Sales Other Income (Expense), Net Interest Expense Other Non-Operating Income (Expense), Net 2020 2019 2020 2019 2020 2019 2020 2019 2020 2019 Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded $2,216.3 $2,187.7 $1,460.1 $1,474.7 $8.1 $10.4 $19.3 $35.4 $7.1 $13.7 (Gain) Loss Effects of Cash Flow Hedging: Forward Exchange Contracts: Amount reclassified from OCI into income (A) ($0.2 ) $— ($0.6 ) ($0.1 ) $— $24.8 $— $4.2 $5.9 $— Amount excluded from effectiveness testing recognized in earnings based on amortization approach (A) — — — — — — — — 4.1 — Other: Amount reclassified from OCI into income (B) — — — — — 18.5 1.0 1.0 (32.2 ) — Total (Gain) Loss Reclassified from OCI to Income (0.2 ) — (0.6 ) (0.1 ) — 43.3 1.0 5.2 (22.2 ) — Tax effects — — 0.1 — — (10.1 ) (0.3 ) (1.4 ) 5.2 — Net (Gain) Loss Reclassified from OCI to Income ($0.2 ) $— ($0.5 ) ($0.1 ) $— $33.2 $0.7 $3.8 ($17.0 ) $— (Gain) Loss Effects of Fair Value Hedging: Other: Hedged items $— $— $— $— $— $— $3.5 $— $— $— Derivatives designated as hedging instruments — — — — — — (3.5 ) — — — Total (Gain) Loss Recognized in Income $— $— $— $— $— $— $— $— $— $— Six Months Ended 31 March Sales Cost of Sales Other Income (Expense), Net Interest Expense Other Non-Operating Income (Expense), Net 2020 2019 2020 2019 2020 2019 2020 2019 2020 2019 Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded $4,471.0 $4,411.7 $2,946.7 $3,018.7 $20.4 $19.0 $38.0 $72.7 $16.2 $32.2 (Gain) Loss Effects of Cash Flow Hedging: Forward Exchange Contracts: Amount reclassified from OCI into income (A) ($0.1 ) $0.4 ($0.8 ) $0.1 $— $12.9 $— $8.4 ($17.5 ) $— Amount excluded from effectiveness testing recognized in earnings based on amortization approach (A) — — — — — — — — 8.6 — Other: Amount reclassified from OCI into income (B) — — — — — 20.7 2.0 2.0 (18.6 ) — Total (Gain) Loss Reclassified from OCI to Income (0.1 ) 0.4 (0.8 ) 0.1 — 33.6 2.0 10.4 (27.5 ) — Tax effects — (0.1 ) 0.2 — — (7.8 ) (0.6 ) (2.8 ) 6.2 — Net (Gain) Loss Reclassified from OCI to Income ($0.1 ) $0.3 ($0.6 ) $0.1 $— $25.8 $1.4 $7.6 ($21.3 ) $— (Gain) Loss Effects of Fair Value Hedging: Other: Hedged items $— $— $— $— $— $— $2.6 $2.6 $— $— Derivatives designated as hedging instruments — — — — — — (2.6 ) (2.6 ) — — Total (Gain) Loss Recognized in Income $— $— $— $— $— $— $— $— $— $— (A) Net amount excluded from effectiveness testing recognized in interest expense for fiscal year 2019, see Note 2 , New Accounting Guidance , for additional details. (B) Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap. The tables below summarize the location and amounts recognized in income related to our derivatives not designated as hedging instruments by contract type: Three Months Ended 31 March Other Income (Expense), net Other Non-Operating Income (Expense), net 2020 2019 2020 2019 The Effects of Derivatives Not Designated as a Hedging Instruments: Forward Exchange Contracts ($2.4 ) $2.2 $1.2 $— Other — 1.3 — — Total (Gain) Loss Recognized in Income ($2.4 ) $3.5 $1.2 $— Six Months Ended 31 March Other Income (Expense) Other Non-Operating Income (Expense) 2020 2019 2020 2019 The Effects of Derivatives Not Designated as a Hedging Instruments: Forward Exchange Contracts ($2.2 ) $2.3 $0.6 $— Other — 0.5 0.4 — Total (Gain) Loss Recognized in Income ($2.2 ) $2.8 $1.0 $— The amount of unrealized gains and losses related to cash flow hedges as of 31 March 2020 that are expected to be reclassified to earnings in the next twelve months is not material. The cash flows related to all derivative contracts are reported in the operating activities section of the consolidated statements of cash flows. Credit Risk-Related Contingent Features Certain derivative instruments are executed under agreements that require us to maintain a minimum credit rating with both Standard & Poor’s and Moody’s. If our credit rating falls below this threshold, the counterparty to the derivative instruments has the right to request full collateralization on the derivatives’ net liability position. The net liability position of derivatives with credit risk-related contingent features was $32.5 and $30.1 as of 31 March 2020 and 30 September 2019 , respectively. Because our current credit rating is above the various pre-established thresholds, no collateral has been posted on these liability positions. Counterparty Credit Risk Management We execute financial derivative transactions with counterparties that are highly rated financial institutions, all of which are investment grade at this time. Some of our underlying derivative agreements give us the right to require the institution to post collateral if its credit rating falls below the pre-established thresholds with Standard & Poor’s or Moody’s. The collateral that the counterparties would be required to post was $204.8 and $157.1 as of 31 March 2020 and 30 September 2019 , respectively. No financial institution is required to post collateral at this time as all have credit ratings at or above threshold.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is defined as an exit price, or the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels as follows: Level 1 — Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 — Inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the asset or liability. Level 3 — Inputs that are unobservable for the asset or liability based on our own assumptions about the assumptions market participants would use in pricing the asset or liability. The methods and assumptions used to measure the fair value of financial instruments are as follows: Short-term Investments Short-term investments primarily include time deposits with original maturities greater than three months and less than one year. We estimated the fair value of our short-term investments, which approximates carrying value as of the balance sheet date, using level 2 inputs within the fair value hierarchy. Level 2 measurements were based on current interest rates for similar investments with comparable credit risk and time to maturity. Derivatives The fair value of our interest rate management contracts and forward exchange contracts are quantified using the income approach and are based on estimates using standard pricing models. These models consider the value of future cash flows as of the balance sheet date, discounted to a present value using discount factors that match both the time to maturity and currency of the underlying instruments. The computation of the fair values of these instruments is generally performed by the Company. These standard pricing models utilize inputs that are derived from or corroborated by observable market data such as interest rate yield curves as well as currency spot and forward rates; therefore, the fair value of our derivatives is classified as a level 2 measurement. On an ongoing basis, we randomly test a subset of our valuations against valuations received from the transaction’s counterparty to validate the accuracy of our standard pricing models. Counterparties to these derivative contracts are highly rated financial institutions. Refer to Note 10 , Financial Instruments , for a description of derivative instruments, including details related to the balance sheet line classifications. Long-term Debt, Including Related Party The fair value of our debt is based on estimates using standard pricing models that consider the value of future cash flows as of the balance sheet date, discounted to a present value using discount factors that match both the time to maturity and currency of the underlying instruments. These standard valuation models utilize observable market data such as interest rate yield curves and currency spot rates; therefore, the fair value of our debt is classified as a level 2 measurement. We generally perform the computation of the fair value of these instruments. The carrying values and fair values of financial instruments were as follows: 31 March 2020 30 September 2019 Carrying Value Fair Value Carrying Value Fair Value Assets Derivatives Forward exchange contracts $157.2 $157.2 $138.0 $138.0 Interest rate management contracts 117.0 117.0 86.2 86.2 Liabilities Derivatives Forward exchange contracts $83.8 $83.8 $110.6 $110.6 Interest rate management contracts 0.5 0.5 1.8 1.8 Long-term debt, including current portion and related party 3,283.6 3,344.0 3,267.8 3,350.9 The carrying amounts reported on the consolidated balance sheets for cash and cash items, short-term investments, trade receivables, payables and accrued liabilities, accrued income taxes, and short-term borrowings approximate fair value due to the short-term nature of these instruments. Accordingly, these items have been excluded from the above table. The following table summarizes assets and liabilities on the consolidated balance sheets that are measured at fair value on a recurring basis: 31 March 2020 30 September 2019 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets at Fair Value Derivatives Forward exchange contracts $157.2 $— $157.2 $— $138.0 $— $138.0 $— Interest rate management contracts 117.0 — 117.0 — 86.2 — 86.2 — Total Assets at Fair Value $274.2 $— $274.2 $— $224.2 $— $224.2 $— Liabilities at Fair Value Derivatives Forward exchange contracts $83.8 $— $83.8 $— $110.6 $— $110.6 $— Interest rate management contracts 0.5 — 0.5 — 1.8 — 1.8 — Total Liabilities at Fair Value $84.3 $— $84.3 $— $112.4 $— $112.4 $—

Retirement Benefits

Retirement Benefits	6 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Retirement Benefits	RETIREMENT BENEFITS The components of net periodic benefit cost for our defined benefit pension plans for the three and six months ended 31 March 2020 and 2019 were as follows: Pension Benefits 2020 2019 Three Months Ended 31 March U.S. International U.S. International Service cost $5.8 $5.8 $5.3 $4.9 Interest cost 22.8 6.2 28.4 9.0 Expected return on plan assets (47.2 ) (19.4 ) (43.1 ) (19.2 ) Prior service cost amortization 0.3 — 0.3 0.1 Actuarial loss amortization 21.0 4.9 16.5 2.8 Settlements 1.5 — 5.0 — Special termination benefits — — — — Other — 0.2 — 0.1 Net Periodic (Benefit) Cost $4.2 ($2.3 ) $12.4 ($2.3 ) Pension Benefits 2020 2019 Six Months Ended 31 March U.S. International U.S. International Service cost $11.6 $11.7 $10.7 $9.8 Interest cost 45.6 12.4 56.8 18.0 Expected return on plan assets (94.4 ) (38.9 ) (86.2 ) (38.1 ) Prior service cost amortization 0.6 — 0.6 0.1 Actuarial loss amortization 42.0 9.8 32.6 5.6 Settlements 1.5 — 5.8 0.2 Special termination benefits — — 0.7 — Other — 0.4 — 0.4 Net Periodic (Benefit) Cost $6.9 ($4.6 ) $21.0 ($4.0 ) Our service costs are primarily included within "Cost of sales" and "Selling and administrative" on our consolidated income statements. The amount of service costs capitalized in the first six months of fiscal year s 2020 and 2019 were not material. The non-service related costs, including pension settlement losses, are presented outside operating income within "Other non-operating income (expense), net." For the six months ended 31 March 2020 and 2019 , our cash contributions to funded pension plans and benefit payments under unfunded pension plans were $14.9 and $25.5 , respectively. Total contributions for fiscal year 2020 are expected to be approximately $30 to $40 . During fiscal year 2019 , total contributions were $40.2 . Certain of our pension plans provide for a lump sum benefit payment option at the time of retirement, or for corporate officers, six months after their retirement date. A participant’s vested benefit is considered settled upon cash payment of the lump sum. We recognize pension settlement losses when cash payments exceed the sum of the service and interest cost components of net periodic benefit cost of the plan for the fiscal year. We recognized pension settlement losses of $1.5 and $5.0 in the second quarter of fiscal years 2020 and 2019, respectively, to accelerate recognition of a portion of actuarial losses deferred in accumulated other comprehensive loss, primarily associated with the U.S. supplementary pension plan. U.K. Lloyds Pensions Equalization Ruling On 26 October 2018, the United Kingdom High Court issued a ruling related to the equalization of pension plan participants’ benefits for the gender effects of Guaranteed Minimum Pensions. As a result of this ruling, we estimated the impact of retroactively increasing benefits in our U.K. plan in accordance with the High Court ruling. We treated the additional benefits as a prior service cost, which resulted in an increase to our projected benefit obligation and accumulated other comprehensive loss of $4.7

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Litigation We are involved in various legal proceedings, including commercial, competition, environmental, intellectual property, regulatory, product liability, and insurance matters. In September 2010, the Brazilian Administrative Council for Economic Defense ("CADE") issued a decision against our Brazilian subsidiary, Air Products Brasil Ltda., and several other Brazilian industrial gas companies for alleged anticompetitive activities. CADE imposed a civil fine of R$179.2 million (approximately $34 at 31 March 2020 ) on Air Products Brasil Ltda. This fine was based on a recommendation by a unit of the Brazilian Ministry of Justice, whose investigation began in 2003, alleging violation of competition laws with respect to the sale of industrial and medical gases. The fines are based on a percentage of our total revenue in Brazil in 2003. We have denied the allegations made by the authorities and filed an appeal in October 2010 with the Brazilian courts. On 6 May 2014, our appeal was granted and the fine against Air Products Brasil Ltda. was dismissed. CADE has appealed that ruling and the matter remains pending. We, with advice of our outside legal counsel, have assessed the status of this matter and have concluded that, although an adverse final judgment after exhausting all appeals is possible, such a judgment is not probable. As a result, no provision has been made in the consolidated financial statements. We estimate the maximum possible loss to be the full amount of the fine of R$179.2 million (approximately $34 at 31 March 2020 ) plus interest accrued thereon until final disposition of the proceedings. Other than this matter, we do not currently believe there are any legal proceedings, individually or in the aggregate, that are reasonably possible to have a material impact on our financial condition, results of operations, or cash flows. Environmental In the normal course of business, we are involved in legal proceedings under the Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA," the federal Superfund law), Resource Conservation and Recovery Act ("RCRA"), and similar state and foreign environmental laws relating to the designation of certain sites for investigation or remediation. Presently, there are 31 sites on which a final settlement has not been reached where we, along with others, have been designated a potentially responsible party by the Environmental Protection Agency or are otherwise engaged in investigation or remediation, including cleanup activity at certain of our current and former manufacturing sites. We continually monitor these sites for which we have environmental exposure. Accruals for environmental loss contingencies are recorded when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. The consolidated balance sheets at 31 March 2020 and 30 September 2019 included an accrual of $87.2 and $68.9 , respectively, primarily as part of other noncurrent liabilities. The environmental liabilities will be paid over a period of up to 30 years . We estimate the exposure for environmental loss contingencies to range from $87 to a reasonably possible upper exposure of $100 as of 31 March 2020 . Actual costs to be incurred at identified sites in future periods may vary from the estimates, given inherent uncertainties in evaluating environmental exposures. Using reasonably possible alternative assumptions of the exposure level could result in an increase to the environmental accrual. Due to the inherent uncertainties related to environmental exposures, a significant increase to the reasonably possible upper exposure level could occur if a new site is designated, the scope of remediation is increased, a different remediation alternative is identified, or a significant increase in our proportionate share occurs. We do not expect that any sum we may have to pay in connection with environmental matters in excess of the amounts recorded or disclosed above would have a material adverse impact on our financial position or results of operations in any one year. Pace At 31 March 2020 , $42.7 of the environmental accrual was related to the Pace facility. In 2006, we sold our Amines business, which included operations at Pace, Florida, and recognized a liability for retained environmental obligations associated with remediation activities at Pace. We are required by the Florida Department of Environmental Protection ("FDEP") and the United States Environmental Protection Agency (USEPA) to continue our remediation efforts. We estimated that it would take a substantial period of time to complete the groundwater remediation, and the costs through completion were estimated to range from $42 to $52 . As no amount within the range was a better estimate than another, we recognized a before-tax expense of $42 in fiscal year 2006 in results from discontinued operations and recorded an environmental accrual of $42 in continuing operations on the consolidated balance sheets. During the second quarter of fiscal year 2020, we completed an updated review of the environmental remediation status at the Pace facility. The review was completed in conjunction with requirements to complete financial assurance per the Consent Order discussed below. Based on our review, we expect ongoing activities to continue for 30 years. Additionally, we will require near-term spending to install new wells and piping, as well as future capital to consider the longer than expected time horizon for remediation at the site. As a result of these changes, we increased our environmental accrual for this site by $19 in continuing operations on the consolidated balance sheets and recognized a pre-tax expense of $19 in results from discontinued operations in the second quarter of fiscal year 2020. We have implemented many of the remedial corrective measures at the Pace facility required under 1995 Consent Orders issued by the FDEP and the USEPA. Contaminated soils have been bioremediated, and the treated soils have been secured in a lined on-site disposal cell. Several groundwater recovery systems have been installed to contain and remove contamination from groundwater. We completed an extensive assessment of the site to determine how well existing measures are working, what additional corrective measures may be needed, and whether newer remediation technologies that were not available in the 1990s might be suitable to more quickly and effectively remove groundwater contaminants. Based on assessment results, we completed a focused feasibility study that has identified alternative approaches that may more effectively remove contaminants. We continue to review alternative remedial approaches with the FDEP and have started additional field work to support the design of an improved groundwater recovery network with the objective of targeting areas of higher contaminant concentration and avoiding areas of high groundwater iron which has proven to be a significant operability issue for the project. In the first quarter of 2015, we entered into a new Consent Order with the FDEP requiring us to continue our remediation efforts at the Pace facility, along with the completion of a cost review every 5 years. In the second quarter of fiscal year 2020, we completed an updated cost review which resulted in a change in assumptions regarding future operating costs as discussed above. The costs we are incurring based on the fiscal year 2020 review are higher than our previous estimates. Piedmont At 31 March 2020 , $14.0 of the environmental accrual was related to the Piedmont site. On 30 June 2008, we sold our Elkton, Maryland, and Piedmont, South Carolina, production facilities and the related North American atmospheric emulsions and global pressure sensitive adhesives businesses. In connection with the sale, we recognized a liability for retained environmental obligations associated with remediation activities at the Piedmont site. This site is under active remediation for contamination caused by an insolvent prior owner. We are required by the South Carolina Department of Health and Environmental Control ("SCDHEC") to address both contaminated soil and groundwater. Numerous areas of soil contamination have been addressed, and contaminated groundwater is being recovered and treated. The SCDHEC issued its final approval to the site-wide feasibility study on 13 June 2017 and the Record of Decision for the site on 27 June 2018. Field work has started to support the remedial design, and in the fourth quarter of fiscal year 2018, we signed a Consent Agreement Amendment memorializing our obligations to complete the cleanup of the site. We estimate that source area remediation and groundwater recovery and treatment will continue through 2029. Thereafter, we expect this site to go into a state of monitored natural attenuation through 2047. We recognized a before-tax expense of $24 in 2008 as a component of income from discontinued operations and recorded an environmental liability of $24 in continuing operations on the consolidated balance sheets. There have been no significant changes to the estimated exposure. Pasadena At 31 March 2020 , $11.6 of the environmental accrual was related to the Pasadena site. During the fourth quarter of 2012, management committed to permanently shutting down our polyurethane intermediates ("PUI") production facility in Pasadena, Texas. In shutting down and dismantling the facility, we have undertaken certain obligations related to soil and groundwater contaminants. We have been pumping and treating groundwater to control off-site contaminant migration in compliance with regulatory requirements and under the approval of the Texas Commission on Environmental Quality ("TCEQ"). We estimate that the pump and treat system will continue to operate until 2042 . We plan to perform additional work to address other environmental obligations at the site. This additional work includes remediating, as required, impacted soils, investigating groundwater west of the former PUI facility, performing post closure care for two closed RCRA surface impoundment units, and establishing engineering controls. In 2012, we estimated the total exposure at this site to be $13 . There have been no significant changes to the estimated exposure.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION We have various share-based compensation programs, which include deferred stock units, stock options, and restricted stock. During the six months ended 31 March 2020 , we granted market-based and time-based deferred stock units. Under all programs, the terms of the awards are fixed at the grant date. We issue shares from treasury stock upon the payout of deferred stock units, the exercise of stock options, and the issuance of restricted stock awards. As of 31 March 2020 , there were 4,321,658 shares available for future grant under our Long-Term Incentive Plan ("LTIP"), which is shareholder approved. Share-based compensation cost recognized on the consolidated income statements is summarized below: Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 Before-tax share-based compensation cost $13.5 $11.9 $28.9 $21.2 Income tax benefit (3.1 ) (2.8 ) (6.8 ) (5.0 ) After-tax share-based compensation cost $10.4 $9.1 $22.1 $16.2 Before-tax share-based compensation cost is primarily included in "Selling and administrative" on our consolidated income statements. The amount of share-based compensation cost capitalized in the first six months of fiscal years 2020 and 2019 was not material. Deferred Stock Units During the six months ended 31 March 2020 , we granted 80,215 market-based deferred stock units. The market-based deferred stock units are earned at the end of the performance period beginning 1 October 2019 and ending 30 September 2022, conditioned on the level of the Company’s total shareholder return in relation to a defined peer group over the three -year performance period. The market-based deferred stock units had an estimated grant-date fair value of $275.19 per unit, which was estimated using a Monte Carlo simulation model. The model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the grant and calculates the fair value of the awards. We generally expense the grant-date fair value of these awards on a straight-line basis over the vesting period. The calculation of the fair value of market-based deferred stock units used the following assumptions: Expected volatility 17.8 % Risk-free interest rate 1.6 % Expected dividend yield 2.4 % In addition, during the six months ended 31 March 2020 , we granted 118,194 time-based deferred stock units at a weighted average grant-date fair value of $229.15 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The tables below summarize changes in accumulated other comprehensive loss ("AOCL"), net of tax, attributable to Air Products for the three and six months ended 31 March 2020 : Derivatives qualifying as hedges Foreign currency translation adjustments Pension and postretirement benefits Total Balance at 31 December 2019 ($48.5 ) ($1,102.5 ) ($937.6 ) ($2,088.6 ) Other comprehensive loss before reclassifications (27.4 ) (398.2 ) — (425.6 ) Amounts reclassified from AOCL (17.0 ) — 21.2 4.2 Net current period other comprehensive income (loss) (44.4 ) (398.2 ) 21.2 (421.4 ) Amount attributable to noncontrolling interests (25.6 ) (6.2 ) — (31.8 ) Balance at 31 March 2020 ($67.3 ) ($1,494.5 ) ($916.4 ) ($2,478.2 ) Derivatives qualifying as hedges Foreign currency translation adjustments Pension and postretirement benefits Total Balance at 30 September 2019 ($61.4 ) ($1,356.9 ) ($957.3 ) ($2,375.6 ) Other comprehensive loss before reclassifications (5.3 ) (134.2 ) — (139.5 ) Amounts reclassified from AOCL (20.6 ) — 40.9 20.3 Net current period other comprehensive income (loss) (25.9 ) (134.2 ) 40.9 (119.2 ) Amount attributable to noncontrolling interests (20.0 ) 3.4 — (16.6 ) Balance at 31 March 2020 ($67.3 ) ($1,494.5 ) ($916.4 ) ($2,478.2 ) The table below summarizes the reclassifications out of AOCL and the affected line item on the consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 (Gain) Loss on Cash Flow Hedges, net of tax Sales/Cost of sales ($0.7 ) ($0.1 ) ($0.7 ) $0.4 Other income/expense, net — 33.2 — 25.8 Interest expense 0.7 3.8 1.4 7.6 Other non-operating income (expense), net (A) (17.0 ) — (21.3 ) — Total (Gain) Loss on Cash Flow Hedges, net of tax ($17.0 ) $36.9 ($20.6 ) $33.8 Pension and Postretirement Benefits, net of tax (B) $21.2 $18.7 $40.9 $33.9 (A) The fiscal year 2020 impact includes amortization of the excluded component and the effective portion of the related hedges. (B) The components of net periodic benefit cost reclassified out of AOCL include items such as prior service cost amortization, actuarial loss amortization, and settlements and are included in “Other non-operating income (expense), net” on the consolidated income statements. Refer to Note 12 , Retirement Benefits , for additional information.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share ("EPS"): Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 Numerator Net income from continuing operations $492.1 $421.3 $967.7 $768.8 Net loss from discontinued operations (14.3 ) — (14.3 ) — Net Income Attributable to Air Products $477.8 $421.3 $953.4 $768.8 Denominator (in millions) Weighted average common shares — Basic 221.2 220.2 221.0 220.0 Effect of dilutive securities Employee stock option and other award plans 1.1 1.2 1.2 1.2 Weighted average common shares — Diluted 222.3 221.4 222.2 221.2 Basic EPS Attributable to Air Products (A) Basic EPS from continuing operations $2.22 $1.91 $4.38 $3.49 Basic EPS from discontinued operations (0.06 ) — (0.06 ) — Basic EPS Attributable to Air Products $2.16 $1.91 $4.31 $3.49 Diluted EPS Attributable to Air Products (A) Diluted EPS from continuing operations $2.21 $1.90 $4.36 $3.48 Diluted EPS from discontinued operations (0.06 ) — (0.06 ) — Diluted EPS Attributable to Air Products $2.15 $1.90 $4.29 $3.48 (A) Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding. For the three and six months ended 31 March 2020 and 2019 , there were no

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES India Finance Act 2020 On 27 March 2020, the Indian government passed Finance Act 2020 (the "India Finance Act"), which amended rules regarding the taxation of dividends declared and distributed by Indian companies. Under the India Finance Act, future dividends declared or distributed by an Indian company are no longer subject to dividend distribution tax. Instead, the non-resident recipient will be subject to a withholding tax. As a result of the India Finance Act, we recorded a net benefit of $13.5 in March 2020 related to our equity affiliate investment in INOX Air Products Private Limited ("INOX"). This included a benefit of $33.8 for our share of accumulated dividend distribution taxes released with respect to INOX. This benefit is reflected within "Equity affiliates' income" on our consolidated income statements and has been excluded from the results of our Industrial Gases – Asia segment. In addition, our income tax provision reflects an expense of $20.3 for estimated withholding taxes that we may incur on future dividends. U.S. Tax Cuts and Jobs Act Our income tax provision for the six months ended 31 March 2019 reflected a discrete net income tax expense of $40.6 related to impacts from the U.S. Tax Cuts and Jobs Act (the “Tax Act”). The net expense included the reversal of a non-recurring $56.2 benefit recorded in fiscal year 2018 related to the U.S. taxation of deemed foreign dividends. This was partially offset by a benefit of $15.6 to finalize our estimates of the impacts of the Tax Act and reduce the total expected costs of the deemed repatriation tax. Effective Tax Rate The effective tax rate was 22.7% and 21.3% for the three and six months ended 31 March 2020 , respectively. The effective tax rate was 19.9% and 23.3% for the three and six months ended 31 March 2019 , respectively. Cash Paid for Taxes (Net of Cash Refunds) Income tax payments, net of refunds, were $253.5 and $165.6 for the six months ended 31 March 2020 and 2019 , respectively.

Supplemental Information

Supplemental Information	6 Months Ended
	Mar. 31, 2020
Disclosure Text Block Supplement [Abstract]
Supplemental Information	SUPPLEMENTAL INFORMATION Company Headquarters Relocation Income (Expense) During the second quarter of fiscal year 2020, we sold property at our current corporate headquarters located in Trexlertown, Pennsylvania, for net proceeds of $44.1 . The sale was completed in anticipation of relocating our U.S. headquarters and resulted in a gain of $33.8 . This gain is reflected on our consolidated income statements as " Company headquarters relocation income (expense) " for the three and six months ended 31 March 2020 and has been excluded from the results of the Corporate and other segment. Facility Closure In December 2018, one of our customers was subject to a government enforced shutdown due to environmental reasons. As a result, we recognized a charge of $29.0 during the first quarter of fiscal year 2019 primarily related to the write-off of onsite assets. This charge is reflected as “Facility closure” on our consolidated income statements for the six months ended 31 March 2019 and has not been recorded in segment results. Related Party Transactions We have related party sales to some of our equity affiliates and joint venture partners as well as other income primarily from fees charged for use of Air Products' patents and technology. Sales to and other income from related parties totaled approximately $90 and $180 for the three and six months ended 31 March 2020 , respectively, and $80 and $165 for the three and six months ended 31 March 2019 , respectively. Sales agreements with related parties include terms that are consistent with those that we believe would have been negotiated at an arm’s length with an independent party. Our consolidated balance sheets include related party trade receivables of approximately $205 and $130 as of 31 March 2020 and 30 September 2019 , respectively. Air Products Lu An (Changzhi) Co., Ltd., our 60% owned JV with Lu'An Clean Energy Company ("Lu'An"), acquired gasification and syngas clean-up assets from Lu'An in 2018. The table below summarizes the related party liabilities resulting from this acquisition as reflected on our consolidated balance sheets: 31 March 30 September 2020 2019 Payables and accrued liabilities 8.9 8.9 Current portion of long-term debt 38.1 37.8 Long-term debt – related party 323.1 320.1

Business Segment Information

Business Segment Information	6 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Business Segment Information	BUSINESS SEGMENT INFORMATION Our reporting segments reflect the manner in which our chief operating decision maker reviews results and allocates resources. Except in the Industrial Gases – EMEA and Corporate and other segments, each reporting segment meets the definition of an operating segment and does not include the aggregation of multiple operating segments. Our Industrial Gases – EMEA and Corporate and other segments each include the aggregation of two operating segments that meet the aggregation criteria under GAAP. Our reporting segments are: • Industrial Gases – Americas; • Industrial Gases – EMEA (Europe, Middle East, and Africa); • Industrial Gases – Asia; • Industrial Gases – Global; and • Corporate and other Industrial Gases – Americas Industrial Gases – EMEA Industrial Gases – Asia Industrial Gases – Global Corporate and other Total Three Months Ended 31 March 2020 Sales $932.4 $492.7 $658.1 $79.3 $53.8 $2,216.3 (A) Operating income (loss) 268.0 124.6 209.1 (19.8 ) (38.5 ) 543.4 (B) Depreciation and amortization 135.5 47.6 104.1 2.4 5.1 294.7 Equity affiliates' income 21.6 13.5 13.8 5.5 — 54.4 (B) Three Months Ended 31 March 2019 Sales $991.7 $494.4 $625.4 $53.8 $22.4 $2,187.7 (A) Operating income (loss) 255.6 122.5 199.7 (12.2 ) (49.1 ) 516.5 (B) Depreciation and amortization 124.9 46.3 84.9 2.0 4.0 262.1 Equity affiliates' income 17.8 13.3 13.8 1.3 — 46.2 (B) Industrial Gases – Americas Industrial Gases – EMEA Industrial Gases – Asia Industrial Gases – Global Corporate and other Total Six Months Ended 31 March 2020 Sales $1,868.6 $991.4 $1,350.9 $171.9 $88.2 $4,471.0 (A) Operating income (loss) 525.2 245.1 437.6 (16.2 ) (87.3 ) 1,104.4 (B) Depreciation and amortization 267.3 96.0 205.7 4.8 10.1 583.9 Equity affiliates' income 42.2 32.8 30.7 6.9 — 112.6 (B) Six Months Ended 31 March 2019 Sales $1,980.9 $1,018.6 $1,252.2 $122.0 $38.0 $4,411.7 (A) Operating income (loss) 474.8 228.1 401.5 (8.3 ) (95.6 ) 1,000.5 (B) Depreciation and amortization 250.5 92.6 164.8 4.1 8.1 520.1 Equity affiliates' income 40.4 27.0 30.0 1.7 — 99.1 (B) Total Assets 31 March 2020 $5,933.7 $3,378.8 $6,489.7 $438.1 $3,260.9 $19,501.2 30 September 2019 5,832.2 3,250.8 6,240.6 325.7 3,293.5 18,942.8 (A) The sales information noted above relates to external customers only. All intersegment sales are eliminated in consolidation. Intersegment sales are generally transacted at market pricing. We generally do not have intersegment sales from our regional industrial gases businesses. Equipment manufactured for our regional industrial gases segments are generally transferred at cost and are not reflect as an intersegment sale. (B) Refer to the Reconciliations to Consolidated Results section below. Reconciliations to Consolidated Results The table below reconciles total operating income in the table above to consolidated operating income as reflected on our consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March Operating Income 2020 2019 2020 2019 Total $543.4 $516.5 $1,104.4 $1,000.5 Facility closure — — — (29.0 ) Company headquarters relocation income (expense) 33.8 — 33.8 — Consolidated Operating Income $577.2 $516.5 $1,138.2 $971.5 The table below reconciles total equity affiliates' income in the table above to consolidated equity affiliates' income as reflected on our consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March Equity Affiliates' Income 2020 2019 2020 2019 Total $54.4 $46.2 $112.6 $99.1 India Finance Act 2020 33.8 — 33.8 — Consolidated Equity Affiliates' Income $88.2 $46.2 $146.4 $99.1

Basis of Presentation and Maj_2

Basis of Presentation and Major Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Leases	Leases As lessee, we recognize a right-of-use ("ROU") asset and lease liability on the balance sheet for all leases with a term in excess of 12 months. We determine if an arrangement contains a lease at inception. The arrangement contains a lease when there is an identifiable asset, we obtain substantially all of the economic benefits from that asset, and we direct how and for what purpose the asset is used during the term of the arrangement. If the initial term of an arrangement is 12 months or less, we have made an accounting election to not assess if these arrangements contain a lease for inclusion on our balance sheet. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Since our leases generally do not provide an implicit discount rate, we use our incremental borrowing rates based on the information available at the commencement date in determining the present value of lease payments. To determine the incremental borrowing rate, we consider our unsecured borrowings and published market rates, and then adjust those rates to assume full collateralization and to factor in the individual lease term, geography, and payment structure. Our lease term includes periods covered by options to extend or terminate the lease when it is reasonably certain that we will exercise an option to extend or not exercise an option to terminate. Lease payments consider our practical expedient to combine amounts for lease and related non-lease components for all classes of underlying assets in which we are lessee. Fixed payments and payments associated with escalation clauses based on an index are included in the ROU asset and lease liability at commencement. Variable lease payments are excluded from the ROU assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. Our variable lease payments primarily include the impact from escalation clauses that are not fixed or based on an index. Prepaid lease payments are included in the recognition of ROU assets. Our lease agreements do not contain any material lease incentives, residual value guarantees or restrictions or covenants.
Foreign Currency	Foreign Currency As further discussed in Note 2 , New Accounting Guidance , we adopted new accounting guidance on hedging activities in fiscal year 2020 that changed the income statement presentation of excluded components (foreign currency forward points and currency swap basis differences) of our cash flow hedges of intercompany loans. This activity is now amortized on a straight-line basis within “Other non-operating income (expense), net" instead of being recognized in "Interest expense." In addition, gains and losses from the foreign currency remeasurement of balances associated with intercompany and third-party financing transactions, related income tax assets and liabilities, and the impact of related hedges are now also reflected within “Other non-operating income (expense), net.” All other gains and losses from foreign currency transactions continue to be reflected within "Other income (expense), net" on our consolidated income statements. Comparative prior year information has not been restated.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The tables below present our consolidated sales disaggregated by supply mode for each of our reporting segments for the three and six months ended 31 March 2020 and 2019 . We believe this presentation best depicts the nature, timing, type of customer, and contract terms for our sales. Industrial Industrial Industrial Industrial Corporate Total % Three Months Ended 31 March 2020 On-site $516.2 $160.3 $425.6 $— $— $1,102.1 50 % Merchant 416.2 332.4 232.5 — — 981.1 44 % Sale of Equipment — — — 79.3 53.8 133.1 6 % Total $932.4 $492.7 $658.1 $79.3 $53.8 $2,216.3 100 % Three Months Ended 31 March 2019 On-site $580.9 $178.6 $386.0 $— $— $1,145.5 52 % Merchant 410.8 315.8 239.4 — — 966.0 44 % Sale of Equipment — — — 53.8 22.4 76.2 4 % Total $991.7 $494.4 $625.4 $53.8 $22.4 $2,187.7 100 % Industrial Industrial Industrial Industrial Corporate Total % Six Months Ended 31 March 2020 On-site $1,050.7 $331.7 $843.9 $— $— $2,226.3 50 % Merchant 817.9 659.7 507.0 — — 1,984.6 44 % Sale of Equipment — — — 171.9 88.2 260.1 6 % Total $1,868.6 $991.4 $1,350.9 $171.9 $88.2 $4,471.0 100 % Six Months Ended 31 March 2019 On-site $1,176.9 $400.8 $767.0 $— $— $2,344.7 53 % Merchant 804.0 617.8 485.2 — — 1,907.0 43 % Sale of Equipment — — — 122.0 38.0 160.0 4 % Total $1,980.9 $1,018.6 $1,252.2 $122.0 $38.0 $4,411.7 100 %
Contract Assets and Liabilities	The table below details balances arising from contracts with customers: Balance Sheet Location 31 March 2020 30 September 2019 Assets Contract assets – current Other receivables and current assets $84.2 $64.3 Contract fulfillment costs – current Other receivables and current assets 84.8 64.5 Liabilities Contract liabilities – current Payables and accrued liabilities 284.1 247.4 Contract liabilities – noncurrent Other noncurrent liabilities 51.2 49.2

Cost Reduction Actions (Tables)

Cost Reduction Actions (Tables)	6 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Summary of Carrying Amount of Accrual for Cost Reduction Actions	The table below summarizes the carrying amount of the accrual as of 31 March 2020 : 2019 Charge $25.5 Cash expenditures (6.9 ) Amount reflected in pension liability (0.3 ) Currency translation adjustment (0.5 ) 30 September 2019 $17.8 Cash expenditures (7.8 ) Currency translation adjustment 0.2 31 March 2020 $10.2

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	The components of inventories are as follows: 31 March 30 September 2020 2019 Finished goods $131.2 $128.8 Work in process 28.5 27.5 Raw materials, supplies and other 240.0 232.0 Inventories $399.7 $388.3

Goodwill (Tables)

Goodwill (Tables)	6 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes to the carrying amount of consolidated goodwill by segment for the six months ended 31 March 2020 are as follows: Industrial Gases– Americas Industrial Gases– EMEA Industrial Gases– Asia Industrial Gases– Global Corporate and other Total Goodwill, net at 30 September 2019 $156.3 $432.3 $178.5 $19.6 $10.4 $797.1 Currency translation and other (7.8 ) (2.0 ) (1.5 ) (0.5 ) — (11.8 ) Goodwill, net at 31 March 2020 $148.5 $430.3 $177.0 $19.1 $10.4 $785.3 31 March 30 September 2020 2019 Goodwill, gross $1,095.9 $1,162.2 Accumulated impairment losses (A) (310.6 ) (365.1 ) Goodwill, net $785.3 $797.1 (A) Accumulated impairment losses include the impacts of currency translation. These losses are attributable to our Latin America reporting unit ("LASA") within the Industrial Gases – Americas segment.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Schedule of Operating Leases	Amounts associated with operating leases, including their presentation on our consolidated balance sheets, as of our most recent balance sheet date and our adoption date are as follows: 31 March 2020 1 October 2019 Operating lease ROU asset Other noncurrent assets $351.1 $332.3 Operating lease liabilities Payables and accrued liabilities 67.2 68.6 Other noncurrent liabilities 326.2 306.7 Total Operating Lease Liabilities $393.4 $375.3 The difference between the ROU assets and lease liabilities recorded upon adoption primarily relate to the land lease associated with our former Energy-from-Waste business in which an ROU asset was not recognized. 31 March 2020 Weighted-average remaining lease term (in years) (A) 15.4 Weighted-average discount rate (B) 2.2 % (A) Calculated on the basis of the remaining lease term and the lease liability balance for each lease as of the reporting date. (B) Calculated on the basis of the discount rate used to calculate the lease liability for each lease as of the reporting date and the remaining balance of the lease payments for each lease as of the reporting date.
Schedule of Maturity Analysis of Lease Liabilities	At 31 March 2020 , the maturity analysis of lease liabilities, showing the undiscounted cash flows, is as follows: Operating Leases 2020 (excluding the six months ended 31 March 2020) $39.2 2021 66.4 2022 48.3 2023 40.6 2024 33.2 Thereafter 232.0 Total Undiscounted Lease Payments $459.7 Imputed interest (66.3 ) Present Value of Lease Liability Recognized on the Balance Sheet $393.4
Schedule of Minimum Payments Due Under Leases at Prior Year End	As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum payments due under leases were as follows: Operating 2020 $75.1 2021 62.6 2022 44.4 2023 35.9 2024 28.6 Thereafter 171.4 Total Undiscounted Lease Payments $418.0
Schedule of Lease Receivables	At 31 March 2020 , minimum lease payments expected to be collected, which reconciles to the total undiscounted minimum lease payments reflected in the table below, were as follows: 2020 (excluding the six months ended 31 March 2020) $79.7 2021 155.4 2022 144.7 2023 138.6 2024 132.6 Thereafter 715.7 Total $1,366.7 Unearned interest income (436.1 ) Lease Receivables, net $930.6
Schedule of Minimum Lease Payments to be Collected for Lessor at Prior Year End	As previously disclosed in our 2019 Form 10-K, at 30 September 2019, prior to our adoption of the new lease guidance, minimum lease payments expected to be collected were as follows: 2020 $162.5 2021 156.9 2022 145.7 2023 139.4 2024 133.2 Thereafter 715.5 Total $1,453.2 Unearned interest income (472.3 ) Lease Receivables, net $980.9

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Instruments	The table below summarizes our outstanding currency price risk management instruments: 31 March 2020 30 September 2019 US$ Notional Years Average Maturity US$ Notional Years Average Maturity Forward Exchange Contracts: Cash flow hedges $2,682.9 0.4 $2,418.2 0.5 Net investment hedges 450.0 1.6 830.8 0.9 Not designated 1,342.3 0.5 1,053.5 0.6 Total Forward Exchange Contracts $4,475.2 0.6 $4,302.5 0.6 The following table summarizes our outstanding interest rate management contracts and cross currency interest rate swaps: 31 March 2020 30 September 2019 US$ Notional Average Pay % Average Receive % Years Average Maturity US$ Notional Average Pay % Average Receive % Years Average Maturity Interest rate swaps (fair value hedge) $200.0 LIBOR 2.76 % 1.6 $200.0 LIBOR 2.76 % 2.1 Cross currency interest rate swaps (net investment hedge) $222.9 4.74 % 3.32 % 3.0 $216.8 4.80 % 3.31 % 3.5 Cross currency interest rate swaps (cash flow hedge) $1,063.6 4.83 % 3.07 % 2.0 $1,129.3 4.92 % 3.04 % 2.3 Cross currency interest rate swaps (not designated) $— — % — % 0.0 $6.1 2.55 % 3.72 % 4.5
Schedule of Cumulative Basis Adjustments for Fair Value Hedges	The table below provides the amounts recorded on the consolidated balance sheet related to cumulative basis adjustments for fair value hedges: Carrying amounts of hedged item Cumulative hedging adjustment, included in carrying amount Balance Sheet Location 31 March 2020 30 September 2019 31 March 2020 30 September 2019 Long-term debt $407.4 $404.7 $7.8 $5.2
Schedule of Fair Value and Balance Sheet Location of Derivative Instruments	The table below summarizes the fair value and balance sheet location of our outstanding derivatives: Balance Sheet Location 31 March 2020 30 September 2019 Balance Sheet Location 31 March 2020 30 September 2019 Derivatives Designated as Hedging Instruments: Forward exchange contracts Other receivables and current assets $90.7 $79.0 Payables and accrued liabilities $40.5 $53.8 Interest rate management contracts Other receivables and current assets 33.7 24.8 Payables and accrued liabilities 0.5 1.1 Forward exchange contracts Other noncurrent assets 16.3 11.9 Other noncurrent liabilities 2.0 0.7 Interest rate management contracts Other noncurrent assets 83.3 60.9 Other noncurrent liabilities — 0.7 Total Derivatives Designated as Hedging Instruments $224.0 $176.6 $43.0 $56.3 Derivatives Not Designated as Hedging Instruments: Forward exchange contracts Other receivables and current assets $40.0 $38.7 Payables and accrued liabilities $19.7 $36.3 Forward exchange contracts Other noncurrent assets 10.2 8.4 Other noncurrent liabilities 21.6 19.8 Interest rate management contracts Other noncurrent assets — 0.5 Other noncurrent liabilities — — Total Derivatives Not Designated as Hedging Instruments $50.2 $47.6 $41.3 $56.1 Total Derivatives $274.2 $224.2 $84.3 $112.4
Schedule of Gains and Losses Recognized in Other Comprehensive Income Related Net Investment and Cash Flow Hedges	The tables below summarize gains (losses) recognized in other comprehensive income during the period related to our net investment and cash flow hedging relationships: Three Months Ended 31 March Six Months Ended 31 March 2020 2019 2020 2019 Net Investment Hedging Relationships Forward exchange contracts $40.5 $8.2 31.4 23.7 Foreign currency debt 16.7 22.7 (13.2 ) 35.3 Cross currency interest rate swaps 12.4 (3.5 ) 8.9 (2.6 ) Total Amount Recognized in OCI 69.6 27.4 27.1 56.4 Tax effects (16.8 ) (6.7 ) (6.6 ) (13.7 ) Net Amount Recognized in OCI $52.8 $20.7 20.5 42.7 Three Months Ended 31 March Six Months Ended 31 March 2020 2019 2020 2019 Derivatives in Cash Flow Hedging Relationships Forward exchange contracts ($10.1 ) ($22.2 ) 16.2 (13.3 ) Forward exchange contracts, excluded components (2.8 ) (3.6 ) (7.3 ) (7.4 ) Other (A) (8.5 ) (18.3 ) (5.6 ) (34.4 ) Total Amount Recognized in OCI (21.4 ) (44.1 ) 3.3 (55.1 ) Tax effects (6.0 ) 8.7 (8.6 ) 9.4 Net Amount Recognized in OCI ($27.4 ) ($35.4 ) (5.3 ) (45.7 ) (A)
Schedule of Amounts Recognized in Income Related to Cash Flow and Fair Value Hedges	The tables below summarize the location and amounts recognized in income related to our cash flow and fair value hedging relationships by contract type: Three Months Ended 31 March Sales Cost of Sales Other Income (Expense), Net Interest Expense Other Non-Operating Income (Expense), Net 2020 2019 2020 2019 2020 2019 2020 2019 2020 2019 Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded $2,216.3 $2,187.7 $1,460.1 $1,474.7 $8.1 $10.4 $19.3 $35.4 $7.1 $13.7 (Gain) Loss Effects of Cash Flow Hedging: Forward Exchange Contracts: Amount reclassified from OCI into income (A) ($0.2 ) $— ($0.6 ) ($0.1 ) $— $24.8 $— $4.2 $5.9 $— Amount excluded from effectiveness testing recognized in earnings based on amortization approach (A) — — — — — — — — 4.1 — Other: Amount reclassified from OCI into income (B) — — — — — 18.5 1.0 1.0 (32.2 ) — Total (Gain) Loss Reclassified from OCI to Income (0.2 ) — (0.6 ) (0.1 ) — 43.3 1.0 5.2 (22.2 ) — Tax effects — — 0.1 — — (10.1 ) (0.3 ) (1.4 ) 5.2 — Net (Gain) Loss Reclassified from OCI to Income ($0.2 ) $— ($0.5 ) ($0.1 ) $— $33.2 $0.7 $3.8 ($17.0 ) $— (Gain) Loss Effects of Fair Value Hedging: Other: Hedged items $— $— $— $— $— $— $3.5 $— $— $— Derivatives designated as hedging instruments — — — — — — (3.5 ) — — — Total (Gain) Loss Recognized in Income $— $— $— $— $— $— $— $— $— $— Six Months Ended 31 March Sales Cost of Sales Other Income (Expense), Net Interest Expense Other Non-Operating Income (Expense), Net 2020 2019 2020 2019 2020 2019 2020 2019 2020 2019 Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded $4,471.0 $4,411.7 $2,946.7 $3,018.7 $20.4 $19.0 $38.0 $72.7 $16.2 $32.2 (Gain) Loss Effects of Cash Flow Hedging: Forward Exchange Contracts: Amount reclassified from OCI into income (A) ($0.1 ) $0.4 ($0.8 ) $0.1 $— $12.9 $— $8.4 ($17.5 ) $— Amount excluded from effectiveness testing recognized in earnings based on amortization approach (A) — — — — — — — — 8.6 — Other: Amount reclassified from OCI into income (B) — — — — — 20.7 2.0 2.0 (18.6 ) — Total (Gain) Loss Reclassified from OCI to Income (0.1 ) 0.4 (0.8 ) 0.1 — 33.6 2.0 10.4 (27.5 ) — Tax effects — (0.1 ) 0.2 — — (7.8 ) (0.6 ) (2.8 ) 6.2 — Net (Gain) Loss Reclassified from OCI to Income ($0.1 ) $0.3 ($0.6 ) $0.1 $— $25.8 $1.4 $7.6 ($21.3 ) $— (Gain) Loss Effects of Fair Value Hedging: Other: Hedged items $— $— $— $— $— $— $2.6 $2.6 $— $— Derivatives designated as hedging instruments — — — — — — (2.6 ) (2.6 ) — — Total (Gain) Loss Recognized in Income $— $— $— $— $— $— $— $— $— $— (A) Net amount excluded from effectiveness testing recognized in interest expense for fiscal year 2019, see Note 2 , New Accounting Guidance , for additional details. (B) Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap.
Schedule of Effects of Derivatives Not Designated as a Hedging Instrument	The tables below summarize the location and amounts recognized in income related to our derivatives not designated as hedging instruments by contract type: Three Months Ended 31 March Other Income (Expense), net Other Non-Operating Income (Expense), net 2020 2019 2020 2019 The Effects of Derivatives Not Designated as a Hedging Instruments: Forward Exchange Contracts ($2.4 ) $2.2 $1.2 $— Other — 1.3 — — Total (Gain) Loss Recognized in Income ($2.4 ) $3.5 $1.2 $— Six Months Ended 31 March Other Income (Expense) Other Non-Operating Income (Expense) 2020 2019 2020 2019 The Effects of Derivatives Not Designated as a Hedging Instruments: Forward Exchange Contracts ($2.2 ) $2.3 $0.6 $— Other — 0.5 0.4 — Total (Gain) Loss Recognized in Income ($2.2 ) $2.8 $1.0 $—

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Carrying Value and Fair Value of Financial Instruments	The carrying values and fair values of financial instruments were as follows: 31 March 2020 30 September 2019 Carrying Value Fair Value Carrying Value Fair Value Assets Derivatives Forward exchange contracts $157.2 $157.2 $138.0 $138.0 Interest rate management contracts 117.0 117.0 86.2 86.2 Liabilities Derivatives Forward exchange contracts $83.8 $83.8 $110.6 $110.6 Interest rate management contracts 0.5 0.5 1.8 1.8 Long-term debt, including current portion and related party 3,283.6 3,344.0 3,267.8 3,350.9
Schedule of Fair Value Assets and Liabilities Measured On Recurring Basis	The following table summarizes assets and liabilities on the consolidated balance sheets that are measured at fair value on a recurring basis: 31 March 2020 30 September 2019 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Assets at Fair Value Derivatives Forward exchange contracts $157.2 $— $157.2 $— $138.0 $— $138.0 $— Interest rate management contracts 117.0 — 117.0 — 86.2 — 86.2 — Total Assets at Fair Value $274.2 $— $274.2 $— $224.2 $— $224.2 $— Liabilities at Fair Value Derivatives Forward exchange contracts $83.8 $— $83.8 $— $110.6 $— $110.6 $— Interest rate management contracts 0.5 — 0.5 — 1.8 — 1.8 — Total Liabilities at Fair Value $84.3 $— $84.3 $— $112.4 $— $112.4 $—

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost	The components of net periodic benefit cost for our defined benefit pension plans for the three and six months ended 31 March 2020 and 2019 were as follows: Pension Benefits 2020 2019 Three Months Ended 31 March U.S. International U.S. International Service cost $5.8 $5.8 $5.3 $4.9 Interest cost 22.8 6.2 28.4 9.0 Expected return on plan assets (47.2 ) (19.4 ) (43.1 ) (19.2 ) Prior service cost amortization 0.3 — 0.3 0.1 Actuarial loss amortization 21.0 4.9 16.5 2.8 Settlements 1.5 — 5.0 — Special termination benefits — — — — Other — 0.2 — 0.1 Net Periodic (Benefit) Cost $4.2 ($2.3 ) $12.4 ($2.3 ) Pension Benefits 2020 2019 Six Months Ended 31 March U.S. International U.S. International Service cost $11.6 $11.7 $10.7 $9.8 Interest cost 45.6 12.4 56.8 18.0 Expected return on plan assets (94.4 ) (38.9 ) (86.2 ) (38.1 ) Prior service cost amortization 0.6 — 0.6 0.1 Actuarial loss amortization 42.0 9.8 32.6 5.6 Settlements 1.5 — 5.8 0.2 Special termination benefits — — 0.7 — Other — 0.4 — 0.4 Net Periodic (Benefit) Cost $6.9 ($4.6 ) $21.0 ($4.0 )

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Recognized Share-Based Compensation Cost	Share-based compensation cost recognized on the consolidated income statements is summarized below: Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 Before-tax share-based compensation cost $13.5 $11.9 $28.9 $21.2 Income tax benefit (3.1 ) (2.8 ) (6.8 ) (5.0 ) After-tax share-based compensation cost $10.4 $9.1 $22.1 $16.2
Schedule of Assumptions for Fair Value of Market-Based Deferred Stock Units	The calculation of the fair value of market-based deferred stock units used the following assumptions: Expected volatility 17.8 % Risk-free interest rate 1.6 % Expected dividend yield 2.4 %

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The tables below summarize changes in accumulated other comprehensive loss ("AOCL"), net of tax, attributable to Air Products for the three and six months ended 31 March 2020 : Derivatives qualifying as hedges Foreign currency translation adjustments Pension and postretirement benefits Total Balance at 31 December 2019 ($48.5 ) ($1,102.5 ) ($937.6 ) ($2,088.6 ) Other comprehensive loss before reclassifications (27.4 ) (398.2 ) — (425.6 ) Amounts reclassified from AOCL (17.0 ) — 21.2 4.2 Net current period other comprehensive income (loss) (44.4 ) (398.2 ) 21.2 (421.4 ) Amount attributable to noncontrolling interests (25.6 ) (6.2 ) — (31.8 ) Balance at 31 March 2020 ($67.3 ) ($1,494.5 ) ($916.4 ) ($2,478.2 ) Derivatives qualifying as hedges Foreign currency translation adjustments Pension and postretirement benefits Total Balance at 30 September 2019 ($61.4 ) ($1,356.9 ) ($957.3 ) ($2,375.6 ) Other comprehensive loss before reclassifications (5.3 ) (134.2 ) — (139.5 ) Amounts reclassified from AOCL (20.6 ) — 40.9 20.3 Net current period other comprehensive income (loss) (25.9 ) (134.2 ) 40.9 (119.2 ) Amount attributable to noncontrolling interests (20.0 ) 3.4 — (16.6 ) Balance at 31 March 2020 ($67.3 ) ($1,494.5 ) ($916.4 ) ($2,478.2 )
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss)	The table below summarizes the reclassifications out of AOCL and the affected line item on the consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 (Gain) Loss on Cash Flow Hedges, net of tax Sales/Cost of sales ($0.7 ) ($0.1 ) ($0.7 ) $0.4 Other income/expense, net — 33.2 — 25.8 Interest expense 0.7 3.8 1.4 7.6 Other non-operating income (expense), net (A) (17.0 ) — (21.3 ) — Total (Gain) Loss on Cash Flow Hedges, net of tax ($17.0 ) $36.9 ($20.6 ) $33.8 Pension and Postretirement Benefits, net of tax (B) $21.2 $18.7 $40.9 $33.9 (A) The fiscal year 2020 impact includes amortization of the excluded component and the effective portion of the related hedges. (B) The components of net periodic benefit cost reclassified out of AOCL include items such as prior service cost amortization, actuarial loss amortization, and settlements and are included in “Other non-operating income (expense), net” on the consolidated income statements. Refer to Note 12 , Retirement Benefits , for additional information.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share ("EPS"): Three Months Ended Six Months Ended 31 March 31 March 2020 2019 2020 2019 Numerator Net income from continuing operations $492.1 $421.3 $967.7 $768.8 Net loss from discontinued operations (14.3 ) — (14.3 ) — Net Income Attributable to Air Products $477.8 $421.3 $953.4 $768.8 Denominator (in millions) Weighted average common shares — Basic 221.2 220.2 221.0 220.0 Effect of dilutive securities Employee stock option and other award plans 1.1 1.2 1.2 1.2 Weighted average common shares — Diluted 222.3 221.4 222.2 221.2 Basic EPS Attributable to Air Products (A) Basic EPS from continuing operations $2.22 $1.91 $4.38 $3.49 Basic EPS from discontinued operations (0.06 ) — (0.06 ) — Basic EPS Attributable to Air Products $2.16 $1.91 $4.31 $3.49 Diluted EPS Attributable to Air Products (A) Diluted EPS from continuing operations $2.21 $1.90 $4.36 $3.48 Diluted EPS from discontinued operations (0.06 ) — (0.06 ) — Diluted EPS Attributable to Air Products $2.15 $1.90 $4.29 $3.48 (A) Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding.

Supplemental Information (Table

Supplemental Information (Tables)	6 Months Ended
	Mar. 31, 2020
Disclosure Text Block Supplement [Abstract]
Schedule Of Related Party Liabilities Resulting From Acquisitions	Air Products Lu An (Changzhi) Co., Ltd., our 60% owned JV with Lu'An Clean Energy Company ("Lu'An"), acquired gasification and syngas clean-up assets from Lu'An in 2018. The table below summarizes the related party liabilities resulting from this acquisition as reflected on our consolidated balance sheets: 31 March 30 September 2020 2019 Payables and accrued liabilities 8.9 8.9 Current portion of long-term debt 38.1 37.8 Long-term debt – related party 323.1 320.1

Business Segment Information (T

Business Segment Information (Tables)	6 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Industrial Gases – Americas Industrial Gases – EMEA Industrial Gases – Asia Industrial Gases – Global Corporate and other Total Three Months Ended 31 March 2020 Sales $932.4 $492.7 $658.1 $79.3 $53.8 $2,216.3 (A) Operating income (loss) 268.0 124.6 209.1 (19.8 ) (38.5 ) 543.4 (B) Depreciation and amortization 135.5 47.6 104.1 2.4 5.1 294.7 Equity affiliates' income 21.6 13.5 13.8 5.5 — 54.4 (B) Three Months Ended 31 March 2019 Sales $991.7 $494.4 $625.4 $53.8 $22.4 $2,187.7 (A) Operating income (loss) 255.6 122.5 199.7 (12.2 ) (49.1 ) 516.5 (B) Depreciation and amortization 124.9 46.3 84.9 2.0 4.0 262.1 Equity affiliates' income 17.8 13.3 13.8 1.3 — 46.2 (B) Industrial Gases – Americas Industrial Gases – EMEA Industrial Gases – Asia Industrial Gases – Global Corporate and other Total Six Months Ended 31 March 2020 Sales $1,868.6 $991.4 $1,350.9 $171.9 $88.2 $4,471.0 (A) Operating income (loss) 525.2 245.1 437.6 (16.2 ) (87.3 ) 1,104.4 (B) Depreciation and amortization 267.3 96.0 205.7 4.8 10.1 583.9 Equity affiliates' income 42.2 32.8 30.7 6.9 — 112.6 (B) Six Months Ended 31 March 2019 Sales $1,980.9 $1,018.6 $1,252.2 $122.0 $38.0 $4,411.7 (A) Operating income (loss) 474.8 228.1 401.5 (8.3 ) (95.6 ) 1,000.5 (B) Depreciation and amortization 250.5 92.6 164.8 4.1 8.1 520.1 Equity affiliates' income 40.4 27.0 30.0 1.7 — 99.1 (B) Total Assets 31 March 2020 $5,933.7 $3,378.8 $6,489.7 $438.1 $3,260.9 $19,501.2 30 September 2019 5,832.2 3,250.8 6,240.6 325.7 3,293.5 18,942.8 (A) The sales information noted above relates to external customers only. All intersegment sales are eliminated in consolidation. Intersegment sales are generally transacted at market pricing. We generally do not have intersegment sales from our regional industrial gases businesses. Equipment manufactured for our regional industrial gases segments are generally transferred at cost and are not reflect as an intersegment sale. (B) Refer to the Reconciliations to Consolidated Results section below.
Reconciliation of Segments to Consolidated Operating Income	The table below reconciles total operating income in the table above to consolidated operating income as reflected on our consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March Operating Income 2020 2019 2020 2019 Total $543.4 $516.5 $1,104.4 $1,000.5 Facility closure — — — (29.0 ) Company headquarters relocation income (expense) 33.8 — 33.8 — Consolidated Operating Income $577.2 $516.5 $1,138.2 $971.5
Reconciliation of Segments to Consolidated Equity Affiliates' Income	The table below reconciles total equity affiliates' income in the table above to consolidated equity affiliates' income as reflected on our consolidated income statements: Three Months Ended Six Months Ended 31 March 31 March Equity Affiliates' Income 2020 2019 2020 2019 Total $54.4 $46.2 $112.6 $99.1 India Finance Act 2020 33.8 — 33.8 — Consolidated Equity Affiliates' Income $88.2 $46.2 $146.4 $99.1

New Accounting Guidance (Narrat

New Accounting Guidance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities	$ 393.4		$ 393.4
Right-of-use assets	351.1		351.1
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities					$ 375.3
Right-of-use assets					$ 332.3
Other Non-Operating Income (Expense), Net | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excluded components recognized within earnings	$ 8.5		$ 17.4
Interest Expense | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excluded components recognized within earnings		$ 9.1		$ 17.4

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Sales		$ 2,216.3	$ 2,187.7	$ 4,471	$ 4,411.7
Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	$ 2,216.3	$ 2,187.7	$ 4,471	$ 4,411.7
Percent sales by supply mode		100.00%	100.00%	100.00%	100.00%
Industrial Gases - Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	$ 932.4	$ 991.7	$ 1,868.6	$ 1,980.9
Industrial Gases - EMEA | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	492.7	494.4	991.4	1,018.6
Industrial Gases - Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	658.1	625.4	1,350.9	1,252.2
Industrial Gases - Global | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	79.3	53.8	171.9	122
Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	[1]	53.8	22.4	88.2	38
On-site | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 1,102.1	$ 1,145.5	$ 2,226.3	$ 2,344.7
Percent sales by supply mode		50.00%	52.00%	50.00%	53.00%
On-site | Industrial Gases - Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 516.2	$ 580.9	$ 1,050.7	$ 1,176.9
On-site | Industrial Gases - EMEA | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		160.3	178.6	331.7	400.8
On-site | Industrial Gases - Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		425.6	386	843.9	767
On-site | Industrial Gases - Global | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
On-site | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
Merchant | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 981.1	$ 966	$ 1,984.6	$ 1,907
Percent sales by supply mode		44.00%	44.00%	44.00%	43.00%
Merchant | Industrial Gases - Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 416.2	$ 410.8	$ 817.9	$ 804
Merchant | Industrial Gases - EMEA | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		332.4	315.8	659.7	617.8
Merchant | Industrial Gases - Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		232.5	239.4	507	485.2
Merchant | Industrial Gases - Global | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
Merchant | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
Sale of Equipment | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 133.1	$ 76.2	$ 260.1	$ 160
Percent sales by supply mode		6.00%	4.00%	6.00%	4.00%
Sale of Equipment | Industrial Gases - Americas | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 0	$ 0	$ 0	$ 0
Sale of Equipment | Industrial Gases - EMEA | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
Sale of Equipment | Industrial Gases - Asia | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		0	0	0	0
Sale of Equipment | Industrial Gases - Global | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		79.3	53.8	171.9	122
Sale of Equipment | Corporate and other | Operating Segments
Disaggregation of Revenue [Line Items]
Sales		$ 53.8	$ 22.4	$ 88.2	$ 38
[1]	The sales information noted above relates to external customers only. All intersegment sales are eliminated in consolidation. Intersegment sales are generally transacted at market pricing. We generally do not have intersegment sales from our regional industrial gases businesses. Equipment manufactured for our regional industrial gases segments are generally transferred at cost and are not reflect as an intersegment sale.

Revenue Recognition (Remaining

Revenue Recognition (Remaining Performance Obligations) (Details) $ in Billions	Mar. 31, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Transaction price allocated to remaining performance obligations	$ 20
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	50.00%
Estimated timing of recognition of performance obligation	5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	50.00%
Estimated timing of recognition of performance obligation

Revenue Recognition (Contract A

Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Contract Assets and Liabilities
Contract assets - current	$ 84.2	$ 64.3
Contract fulfillment costs - current	84.8	64.5
Contract liabilities - current	284.1	247.4
Contract liabilities - noncurrent	51.2	$ 49.2
Revenue recognized that was previously included in current contract liabilities	$ 95

Discontinued Operations (Narrat

Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Pre-tax loss from discontinued operations	$ 19		$ 19
Net loss from discontinued operations	$ 14.3	$ 0	$ 14.3	$ 0

Cost Reduction Actions (Narrati

Cost Reduction Actions (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2019USD ($)position
Restructuring Cost and Reserve [Line Items]
Cost reduction actions | $	$ 25.5
Severance and other benefits | Cost reduction actions
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	300

Cost Reduction Actions (Carryin

Cost Reduction Actions (Carrying Amount of Accrual) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Cost reduction actions		$ 25.5
Cash expenditures	$ (7.8)	(6.9)
Amount reflected in pension liability		(0.3)
Currency translation adjustment	0.2	(0.5)
Accrued balance	$ 10.2	$ 17.8

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) $ in Millions	Apr. 17, 2020USD ($)production_facility	Mar. 31, 2019USD ($)
ACP Europe SA
Business Acquisition [Line Items]
Business combinations, aggregate purchase price, net of cash acquired		$ 106.3
Subsequent Event | Production Plants
Business Acquisition [Line Items]
Number of hydrogen production plants acquired | production_facility	5
Acquisition of hydrogen production plants	$ 530

Inventories (Schedule of Invent

Inventories (Schedule of Inventory) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 131.2	$ 128.8
Work in process	28.5	27.5
Raw materials, supplies and other	240	232
Inventories	$ 399.7	$ 388.3

Goodwill (Schedule of Goodwill

Goodwill (Schedule of Goodwill by Segment) (Details) $ in Millions	6 Months Ended
	Mar. 31, 2020USD ($)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	$ 797.1
Currency translation and other	(11.8)
Goodwill, net, ending balance	785.3
Industrial Gases - Americas
Goodwill [Roll Forward]
Goodwill, net, beginning balance	156.3
Currency translation and other	(7.8)
Goodwill, net, ending balance	148.5
Industrial Gases - EMEA
Goodwill [Roll Forward]
Goodwill, net, beginning balance	432.3
Currency translation and other	(2)
Goodwill, net, ending balance	430.3
Industrial Gases - Asia
Goodwill [Roll Forward]
Goodwill, net, beginning balance	178.5
Currency translation and other	(1.5)
Goodwill, net, ending balance	177
Industrial Gases - Global
Goodwill [Roll Forward]
Goodwill, net, beginning balance	19.6
Currency translation and other	(0.5)
Goodwill, net, ending balance	19.1
Corporate and other
Goodwill [Roll Forward]
Goodwill, net, beginning balance	10.4
Currency translation and other	0
Goodwill, net, ending balance	$ 10.4

Goodwill (Schedule of Accumulat

Goodwill (Schedule of Accumulated Impairment Losses) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Sep. 30, 2019
Goodwill [Line Items]
Goodwill, gross		$ 1,095.9	$ 1,162.2
Goodwill, net		785.3	797.1
Industrial Gases - Americas
Goodwill [Line Items]
Goodwill, accumulated impairment losses	[1]	(310.6)	(365.1)
Goodwill, net		$ 148.5	$ 156.3
[1]	Accumulated impairment losses include the impacts of currency translation. These losses are attributable to our Latin America reporting unit ("LASA") within the Industrial Gases – Americas segment.

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 20.1	$ 39.5
Use of cash for payments on operating leases		39.1
ROU asset additions		70
Interest income on lease receivables		36.4
Lease payments collected during the period		83.5
Reduction in lease receivable balance		$ 47.1

Leases (Presentation on Consoli

Leases (Presentation on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Oct. 01, 2019
Operating Leases on Consolidated Balance Sheet
Operating lease ROU asset, other noncurrent assets	$ 351.1
Operating lease liabilities, payables and accrued liabilities	67.2
Operating lease liabilities, other noncurrent liabilities	326.2
Total Operating Lease Liabilities	$ 393.4
Accounting Standards Update 2016-02
Operating Leases on Consolidated Balance Sheet
Operating lease ROU asset, other noncurrent assets		$ 332.3
Operating lease liabilities, payables and accrued liabilities		68.6
Operating lease liabilities, other noncurrent liabilities		306.7
Total Operating Lease Liabilities		$ 375.3

Leases (Weighted-Average Remain

Leases (Weighted-Average Remaining Lease Term and Discount Rate) (Details)	Mar. 31, 2020
Leases [Abstract]
Weighted-average remaining lease term (in years)	15 years 4 months 24 days	[1]
Weighted-average discount rate (percent)	2.20%	[2]
[1]	Calculated on the basis of the remaining lease term and the lease liability balance for each lease as of the reporting date.
[2]	Calculated on the basis of the discount rate used to calculate the lease liability for each lease as of the reporting date and the remaining balance of the lease payments for each lease as of the reporting date.

Leases (Maturity Analysis of Le

Leases (Maturity Analysis of Lease Liabilities and Minimum Payments Due) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Maturity Analysis of Operating Lease Liabilities
2020 (excluding the six months ended 31 March 2020)	$ 39.2
2021	66.4
2022	48.3
2023	40.6
2024	33.2
Thereafter	232
Total Undiscounted Lease Payments	459.7
Imputed interest	(66.3)
Present Value of Lease Liability Recognized on the Balance Sheet	$ 393.4
Minimum Payments Due on Operating Leases Prior to Adoption of New Lease Guidance
2020		$ 75.1
2021		62.6
2022		44.4
2023		35.9
2024		28.6
Thereafter		171.4
Total Undiscounted Lease Payments		$ 418

Leases (Minimum Lease Payments

Leases (Minimum Lease Payments Expected to be Collected) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Minimum Lease Payments Expected to be Collected on Sales-type and Direct Financing Leases
2020 (excluding the six months ended 31 March 2020)	$ 79.7
2021	155.4
2022	144.7
2023	138.6
2024	132.6
Thereafter	715.7
Total	1,366.7
Unearned interest income	(436.1)
Lease Receivables, net	$ 930.6
Minimum Lease Payments Expected to be Collected Prior to Adoption of New Lease Guidance
2020		$ 162.5
2021		156.9
2022		145.7
2023		139.4
2024		133.2
Thereafter		715.5
Total		1,453.2
Unearned interest income		(472.3)
Lease Receivables, net		$ 980.9

Financial Instruments (Narrativ

Financial Instruments (Narrative) (Details) € in Millions	6 Months Ended		12 Months Ended
	Mar. 31, 2020USD ($)	Mar. 31, 2020EUR (€)	Sep. 30, 2019USD ($)	Sep. 30, 2019EUR (€)
Derivative [Line Items]
Net liability position of derivatives with credit risk-related contingent features	$ 32,500,000		$ 30,100,000
Collateral posted on liability positions with credit risk-related contingent features	0
Collateral amount that counterparties would be required to post	$ 204,800,000		157,100,000
Forward Exchange Contracts | Cash Flow Hedges
Derivative [Line Items]
Maximum remaining maturity of foreign currency derivatives	3 years 2 months 12 days	3 years 2 months 12 days
Foreign Currency Debt | Euro Denominated
Derivative [Line Items]
Notional amount included in designated foreign currency denominated debt	$ 1,036,100,000	€ 938.8	$ 1,036,900,000	€ 951.3

Financial Instruments (Currency

Financial Instruments (Currency Price Risk Management Instruments) (Details) - Forward Exchange Contracts - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Derivative [Line Items]
US$ Notional	$ 4,475.2	$ 4,302.5
Years Average Maturity	7 months 6 days	7 months 6 days
Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
US$ Notional	$ 2,682.9	$ 2,418.2
Years Average Maturity	4 months 24 days	6 months
Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
US$ Notional	$ 450	$ 830.8
Years Average Maturity	1 year 7 months 6 days	10 months 24 days
Not Designated as Hedging Instrument
Derivative [Line Items]
US$ Notional	$ 1,342.3	$ 1,053.5
Years Average Maturity	6 months	7 months 6 days

Financial Instruments (Interest

Financial Instruments (Interest Rate Management Contracts and Cross Currency Interest Rate Swaps) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Interest Rate Swaps Contracts | Designated as Hedging Instrument | Fair Value Hedges
Derivative [Line Items]
US$ Notional	$ 200	$ 200
Average Pay %	LIBOR	LIBOR
Average Receive %	2.76%	2.76%
Years Average Maturity	1 year 7 months 6 days	2 years 1 month 6 days
Cross Currency Interest Rate Swaps | Designated as Hedging Instrument | Net Investment Hedges
Derivative [Line Items]
US$ Notional	$ 222.9	$ 216.8
Average Pay %	4.74%	4.80%
Average Receive %	3.32%	3.31%
Years Average Maturity	3 years	3 years 6 months
Cross Currency Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow Hedges
Derivative [Line Items]
US$ Notional	$ 1,063.6	$ 1,129.3
Average Pay %	4.83%	4.92%
Average Receive %	3.07%	3.04%
Years Average Maturity	2 years	2 years 3 months 18 days
Cross Currency Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative [Line Items]
US$ Notional	$ 0	$ 6.1
Average Pay %	0.00%	2.55%
Average Receive %	0.00%	3.72%
Years Average Maturity	0 years	4 years 6 months

Financial Instruments (Carrying

Financial Instruments (Carrying Amount and Cumulative Hedging Adjustment) (Details) - Long-term debt - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amounts of hedged item	$ 407.4	$ 404.7
Cumulative hedging adjustment, included in carrying amount	$ 7.8	$ 5.2

Financial Instruments (Fair Val

Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Derivative [Line Items]
Total Derivatives, Assets	$ 274.2	$ 224.2
Total Derivatives, Liabilities	84.3	112.4
Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	224	176.6
Total Derivatives, Liabilities	43	56.3
Designated as Hedging Instrument | Other Receivables and Current Assets | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Assets	90.7	79
Designated as Hedging Instrument | Other Receivables and Current Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	33.7	24.8
Designated as Hedging Instrument | Other Noncurrent Assets | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Assets	16.3	11.9
Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	83.3	60.9
Designated as Hedging Instrument | Accrued Liabilities | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	40.5	53.8
Designated as Hedging Instrument | Accrued Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	0.5	1.1
Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	2	0.7
Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	0	0.7
Not Designated as Hedging Instrument
Derivative [Line Items]
Total Derivatives, Assets	50.2	47.6
Total Derivatives, Liabilities	41.3	56.1
Not Designated as Hedging Instrument | Other Receivables and Current Assets | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Assets	40	38.7
Not Designated as Hedging Instrument | Other Noncurrent Assets | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Assets	10.2	8.4
Not Designated as Hedging Instrument | Other Noncurrent Assets | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Assets	0	0.5
Not Designated as Hedging Instrument | Accrued Liabilities | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	19.7	36.3
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Forward Exchange Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	21.6	19.8
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Interest Rate Management Contracts
Derivative [Line Items]
Total Derivatives, Liabilities	$ 0	$ 0

Financial Instruments (Gains an

Financial Instruments (Gains and Losses Recognized In Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net Investment Hedging Relationships
Tax effects		$ (11.3)	$ (8)	$ (0.5)	$ (12.9)
Net Amount Recognized in OCI		(398.2)	51.3	(134.2)	(16.8)
Derivatives in Cash Flow Hedging Relationships
Tax effects		(6)		(8.6)
Net Amount Recognized in OCI		(27.4)		(5.3)
Tax effects			8.7		9.4
Net Amount Recognized in OCI			(35.4)		(45.7)
Net Investment Hedges
Net Investment Hedging Relationships
Total Amount Recognized in OCI		69.6		27.1
Total Amount Recognized in OCI			27.4		56.4
Tax effects		(16.8)	(6.7)	(6.6)	(13.7)
Net Amount Recognized in OCI		52.8	20.7	20.5	42.7
Net Investment Hedges | Forward Exchange Contracts
Net Investment Hedging Relationships
Total Amount Recognized in OCI		40.5		31.4
Total Amount Recognized in OCI			8.2		23.7
Net Investment Hedges | Foreign Currency Debt
Net Investment Hedging Relationships
Total Amount Recognized in OCI		16.7		(13.2)
Total Amount Recognized in OCI			22.7		35.3
Net Investment Hedges | Cross Currency Interest Rate Swaps
Net Investment Hedging Relationships
Total Amount Recognized in OCI		12.4		8.9
Total Amount Recognized in OCI			(3.5)		(2.6)
Cash Flow Hedges
Derivatives in Cash Flow Hedging Relationships
Total Amount Recognized in OCI		(21.4)		3.3
Tax effects		(6)		(8.6)
Net Amount Recognized in OCI		(27.4)		(5.3)
Total Amount Recognized in OCI			(44.1)		(55.1)
Tax effects			8.7		9.4
Net Amount Recognized in OCI			(35.4)		(45.7)
Cash Flow Hedges | Forward Exchange Contracts
Derivatives in Cash Flow Hedging Relationships
Total Amount Recognized in OCI		(10.1)		16.2
Total Amount Recognized in OCI			(22.2)		(13.3)
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components
Derivatives in Cash Flow Hedging Relationships
Total Amount Recognized in OCI		(2.8)		(7.3)
Total Amount Recognized in OCI			(3.6)		(7.4)
Cash Flow Hedges | Other
Derivatives in Cash Flow Hedging Relationships
Total Amount Recognized in OCI	[1]	$ (8.5)		$ (5.6)
Total Amount Recognized in OCI	[1]		$ (18.3)		$ (34.4)
[1]	Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap.

Financial Instruments (Cash Flo

Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded
Sales		$ 2,216.3	$ 2,187.7	$ 4,471	$ 4,411.7
Cost of sales		1,460.1	1,474.7	2,946.7	3,018.7
Other income (expense), net		8.1	10.4	20.4	19
Interest expense		19.3	35.4	38	72.7
Other non-operating income (expense), net		7.1	13.7	16.2	32.2
(Gain) Loss Effects of Cash Flow Hedging:
Tax effects		(5)		(5.8)
Net (Gain) Loss Reclassified from OCI to Income		(17)		(20.6)
Tax effects			11.5		10.7
Net (Gain) Loss Reclassified from OCI to Income			36.9		33.8
Cash Flow Hedges | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		(0.2)		(0.1)
Tax effects		0		0
Net (Gain) Loss Reclassified from OCI to Income		(0.2)		(0.1)
Amount reclassified from OCI into income			0		0.4
Tax effects			0		0.1
Net (Gain) Loss Reclassified from OCI to Income			0		0.3
Cash Flow Hedges | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		(0.6)		(0.8)
Tax effects		(0.1)		(0.2)
Net (Gain) Loss Reclassified from OCI to Income		(0.5)		(0.6)
Amount reclassified from OCI into income			(0.1)		0.1
Tax effects			0		0
Net (Gain) Loss Reclassified from OCI to Income			(0.1)		0.1
Cash Flow Hedges | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		0		0
Tax effects		0		0
Net (Gain) Loss Reclassified from OCI to Income		0		0
Amount reclassified from OCI into income			43.3		33.6
Tax effects			10.1		7.8
Net (Gain) Loss Reclassified from OCI to Income			33.2		25.8
Cash Flow Hedges | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		1		2
Tax effects		0.3		0.6
Net (Gain) Loss Reclassified from OCI to Income		0.7		1.4
Amount reclassified from OCI into income			5.2		10.4
Tax effects			1.4		2.8
Net (Gain) Loss Reclassified from OCI to Income			3.8		7.6
Cash Flow Hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		(22.2)		(27.5)
Tax effects		(5.2)		(6.2)
Net (Gain) Loss Reclassified from OCI to Income		(17)		(21.3)
Amount reclassified from OCI into income			0		0
Tax effects			0		0
Net (Gain) Loss Reclassified from OCI to Income			0		0
Cash Flow Hedges | Forward Exchange Contracts | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	(0.2)		(0.1)
Amount reclassified from OCI into income	[1]		0		0.4
Cash Flow Hedges | Forward Exchange Contracts | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	(0.6)		(0.8)
Amount reclassified from OCI into income	[1]		(0.1)		0.1
Cash Flow Hedges | Forward Exchange Contracts | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	0		0
Amount reclassified from OCI into income	[1]		24.8		12.9
Cash Flow Hedges | Forward Exchange Contracts | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	0		0
Amount reclassified from OCI into income	[1]		4.2		8.4
Cash Flow Hedges | Forward Exchange Contracts | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	5.9		(17.5)
Amount reclassified from OCI into income	[1]		0		0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	0		0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	0		0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	0		0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	0		0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	4.1		8.6
Cash Flow Hedges | Other | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0		0
Amount reclassified from OCI into income	[2]		0		0
Cash Flow Hedges | Other | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0		0
Amount reclassified from OCI into income	[2]		0		0
Cash Flow Hedges | Other | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0		0
Amount reclassified from OCI into income	[2]		18.5		20.7
Cash Flow Hedges | Other | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	1		2
Amount reclassified from OCI into income	[2]		1		2
Cash Flow Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	(32.2)		(18.6)
Amount reclassified from OCI into income	[2]		0		0
Fair Value Hedges | Sales
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income		0	0	0	0
Fair Value Hedges | Cost of Sales
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income		0	0	0	0
Fair Value Hedges | Other Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income		0	0	0	0
Fair Value Hedges | Interest Expense
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income		0	0	0	0
Fair Value Hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income		0	0	0	0
Fair Value Hedges | Other | Sales
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		0	0	0	0
Derivatives designated as hedging instruments		0	0	0	0
Fair Value Hedges | Other | Cost of Sales
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		0	0	0	0
Derivatives designated as hedging instruments		0	0	0	0
Fair Value Hedges | Other | Other Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		0	0	0	0
Derivatives designated as hedging instruments		0	0	0	0
Fair Value Hedges | Other | Interest Expense
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		3.5	0	2.6	2.6
Derivatives designated as hedging instruments		(3.5)	0	(2.6)	(2.6)
Fair Value Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		0	0	0	0
Derivatives designated as hedging instruments		$ 0	$ 0	$ 0	$ 0
[1]	Net amount excluded from effectiveness testing recognized in interest expense for fiscal year 2019, see Note 2 , New Accounting Guidance , for additional details.
[2]	Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap.

Financial Instruments (Effects

Financial Instruments (Effects of Derivatives Not Designated as a Hedging Instrument) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Other Income (Expense), Net
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	$ (2.4)	$ 3.5	$ (2.2)	$ 2.8
Other Income (Expense), Net | Forward Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	(2.4)	2.2	(2.2)	2.3
Other Income (Expense), Net | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	0	1.3	0	0.5
Other Non-Operating Income (Expense), Net
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	1.2	0	1	0
Other Non-Operating Income (Expense), Net | Forward Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	1.2	0	0.6	0
Other Non-Operating Income (Expense), Net | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	$ 0	$ 0	$ 0.4	$ 0

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of the Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion and related party, carrying value	$ 3,283.6	$ 3,267.8
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion and related party, fair value	3,344	3,350.9
Forward Exchange Contracts | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	157.2	138
Derivative liabilities	83.8	110.6
Forward Exchange Contracts | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	157.2	138
Derivative liabilities	83.8	110.6
Interest Rate Management Contracts | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	117	86.2
Derivative liabilities	0.5	1.8
Interest Rate Management Contracts | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	117	86.2
Derivative liabilities	$ 0.5	$ 1.8

Fair Value Measurements (Sche_2

Fair Value Measurements (Schedule of Recurring Fair Value Measurements) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	$ 274.2	$ 224.2
Total Liabilities at Fair Value	84.3	112.4
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	0	0
Total Liabilities at Fair Value	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	274.2	224.2
Total Liabilities at Fair Value	84.3	112.4
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	0	0
Total Liabilities at Fair Value	0	0
Forward Exchange Contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	157.2	138
Derivative liabilities	83.8	110.6
Forward Exchange Contracts | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Forward Exchange Contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	157.2	138
Derivative liabilities	83.8	110.6
Forward Exchange Contracts | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Interest Rate Management Contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	117	86.2
Derivative liabilities	0.5	1.8
Interest Rate Management Contracts | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Interest Rate Management Contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	117	86.2
Derivative liabilities	0.5	1.8
Interest Rate Management Contracts | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	$ 0	$ 0

Retirement Benefits (Narrative)

Retirement Benefits (Narrative) (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Company contributions			$ 14.9	$ 25.5	$ 40.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 1.5
Minimum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	30		30
Maximum
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year	40		40
International
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 0	$ 0	$ 0	$ (0.2)
Prior service cost arising during period		4.7
U.S. Supplementary Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ 5

Retirement Benefits (Schedule o

Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Settlements	$ (1.5)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.8	$ 5.3	$ 11.6	$ 10.7
Interest cost	22.8	28.4	45.6	56.8
Expected return on plan assets	(47.2)	(43.1)	(94.4)	(86.2)
Prior service cost amortization	0.3	0.3	0.6	0.6
Actuarial loss amortization	21	16.5	42	32.6
Settlements	1.5	5	1.5	5.8
Special termination benefits	0	0	0	0.7
Other	0	0	0	0
Net periodic benefit cost	4.2	12.4	6.9	21
International
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.8	4.9	11.7	9.8
Interest cost	6.2	9	12.4	18
Expected return on plan assets	(19.4)	(19.2)	(38.9)	(38.1)
Prior service cost amortization	0	0.1	0	0.1
Actuarial loss amortization	4.9	2.8	9.8	5.6
Settlements	0	0	0	0.2
Special termination benefits	0	0	0	0
Other	0.2	0.1	0.4	0.4
Net periodic benefit cost	$ (2.3)	$ (2.3)	$ (4.6)	$ (4)

Commitments and Contingencies (

Commitments and Contingencies (Litigation and Environmental - Narrative) (Details) R$ in Millions	1 Months Ended	6 Months Ended
	Sep. 30, 2010BRL (R$)	Mar. 31, 2020USD ($)site	Mar. 31, 2020BRL (R$)site	Sep. 30, 2019USD ($)
Alleged Anticompete Litigation
Loss Contingencies [Line Items]
Civil fines imposed	R$ 179.2	$ 34,000,000
Provision for litigation		0
Maximum of loss contingency range subject to interest		$ 34,000,000	R$ 179.2
Environmental
Loss Contingencies [Line Items]
Approximate number of sites on which settlement has not been reached | site		31	31
Accrual for environmental loss contingencies		$ 87,200,000		$ 68,900,000
Accrual for environmental loss contingencies, maximum payout period		30 years
Environmental | Minimum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies		$ 87,000,000
Environmental | Maximum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies		$ 100,000,000

Commitments and Contingencies_2

Commitments and Contingencies (Pace, Piedmont, Pasadena - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2012	Sep. 30, 2008	Sep. 30, 2006
Loss Contingencies [Line Items]
Pre-tax loss from discontinued operations	$ 19	$ 19
Pace, Florida
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	42.7	42.7			$ 42
Change in estimated exposure	19
Pace, Florida | Discontinued Operations
Loss Contingencies [Line Items]
Pretax environmental expense					42
Pace, Florida | Minimum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies					42
Pace, Florida | Maximum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies					$ 52
Piedmont, South Carolina
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	14	14		$ 24
Piedmont, South Carolina | Discontinued Operations
Loss Contingencies [Line Items]
Pretax environmental expense				$ 24
Pasadena, Texas
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 11.6	$ 11.6
Total anticipated exposure			$ 13

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details)	6 Months Ended
	Mar. 31, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant	4,321,658
Market-Based Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units/shares granted	80,215
Performance period	3 years
Weighted average grant date fair value (in dollars per unit/share) | $ / shares	$ 275.19
Time-Based Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units/shares granted	118,194
Weighted average grant date fair value (in dollars per unit/share) | $ / shares	$ 229.15

Share-Based Compensation (Compe

Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Before-tax share-based compensation cost	$ 13.5	$ 11.9	$ 28.9	$ 21.2
Income tax benefit	(3.1)	(2.8)	(6.8)	(5)
After-tax share-based compensation cost	$ 10.4	$ 9.1	$ 22.1	$ 16.2

Share-Based Compensation (Marke

Share-Based Compensation (Market-Based Deferred Stock Unit Valuation Assumptions) (Details) - Market-Based Deferred Stock Unit	6 Months Ended
	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	17.80%
Risk-free interest rate	1.60%
Expected dividend yield	2.40%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 11,929.8	$ 11,203.4	$ 11,388.3	$ 11,176.3
Other comprehensive loss before reclassifications	(425.6)		(139.5)
Amounts reclassified from AOCL	4.2		20.3
Total Other Comprehensive Income (Loss)	(421.4)	71.5	(119.2)	1.3
Amount attributable to noncontrolling interests	(31.8)	5.1	(16.6)	4.2
Ending balance	11,723.7	11,503.4	11,723.7	11,503.4
Derivatives qualifying as hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(48.5)		(61.4)
Other comprehensive loss before reclassifications	(27.4)		(5.3)
Amounts reclassified from AOCL	(17)		(20.6)
Total Other Comprehensive Income (Loss)	(44.4)		(25.9)
Amount attributable to noncontrolling interests	(25.6)		(20)
Ending balance	(67.3)		(67.3)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,102.5)		(1,356.9)
Other comprehensive loss before reclassifications	(398.2)		(134.2)
Amounts reclassified from AOCL	0		0
Total Other Comprehensive Income (Loss)	(398.2)		(134.2)
Amount attributable to noncontrolling interests	(6.2)		3.4
Ending balance	(1,494.5)		(1,494.5)
Pension and postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(937.6)		(957.3)
Other comprehensive loss before reclassifications	0		0
Amounts reclassified from AOCL	21.2		40.9
Total Other Comprehensive Income (Loss)	21.2		40.9
Amount attributable to noncontrolling interests	0		0
Ending balance	(916.4)		(916.4)
AOCL attributable to Air Products
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,088.6)	(1,811.2)	(2,375.6)	(1,741.9)
Total Other Comprehensive Income (Loss)	(389.6)	66.4	(102.6)	(2.9)
Ending balance	$ (2,478.2)	$ (1,744.8)	$ (2,478.2)	$ (1,744.8)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Reclassification) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income/expense, net		$ (8.1)	$ (10.4)	$ (20.4)	$ (19)
Interest expense		19.3	35.4	38	72.7
Other non-operating income (expense), net		(7.1)	(13.7)	(16.2)	(32.2)
Net Income Attributable to Air Products		(477.8)	(421.3)	(953.4)	(768.8)
Reclassification out of Accumulated Other Comprehensive Income | (Gain) Loss on Cash Flow Hedges, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales/Cost of sales		(0.7)		(0.7)
Other income/expense, net		0		0
Interest expense		0.7		1.4
Other non-operating income (expense), net	[1]	(17)		(21.3)
Net Income Attributable to Air Products		(17)		(20.6)
Reclassification out of Accumulated Other Comprehensive Income | (Gain) Loss on Cash Flow Hedges, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales/Cost of sales			(0.1)		0.4
Other income/expense, net			33.2		25.8
Interest expense			3.8		7.6
Other non-operating income (expense), net			0		0
Net Income Attributable to Air Products			36.9		33.8
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefits, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income Attributable to Air Products	[2]	$ 21.2	$ 18.7	$ 40.9	$ 33.9
[1]	The fiscal year 2020 impact includes amortization of the excluded component and the effective portion of the related hedges.
[2]	The components of net periodic benefit cost reclassified out of AOCL include items such as prior service cost amortization, actuarial loss amortization, and settlements and are included in “Other non-operating income (expense), net” on the consolidated income statements. Refer to Note 12 , Retirement Benefits , for additional information.

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income from continuing operations		$ 492.1	$ 421.3	$ 967.7	$ 768.8
Net loss from discontinued operations		(14.3)	0	(14.3)	0
Net Income Attributable to Air Products		$ 477.8	$ 421.3	$ 953.4	$ 768.8
Weighted average common shares — Basic		221.2	220.2	221	220
Employee stock option and other award plans		1.1	1.2	1.2	1.2
Weighted average common shares — Diluted		222.3	221.4	222.2	221.2
Basic earnings per share from continuing operations (in dollars per share)	[1]	$ 2.22	$ 1.91	$ 4.38	$ 3.49
Basic earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Basic Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	2.16	1.91	4.31	3.49
Diluted earnings per share from continuing operations (in dollars per share)	[1]	2.21	1.90	4.36	3.48
Diluted earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Diluted Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	$ 2.15	$ 1.90	$ 4.29	$ 3.48
[1]	Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding.

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Antidilutive share-based awards excluded from computation of diluted earnings per share (in shares)	0	0	0	0

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Net benefit related to equity affiliate from India Finance Act	$ 13.5		$ 13.5
Proportionate share of accumulated dividend distribution taxes released per the India Finance Act	33.8		33.8
Income tax provision related to estimated withholding taxes on future dividends	$ 20.3		$ 20.3
Discrete net tax expense related to Tax Act				$ 40.6
Reversal of non-recurring benefit related to U.S. taxation of deemed foreign dividends				56.2
Tax benefit related to finalization of assessment of impacts of Tax Act				$ 15.6
Effective tax rate (percent)	22.70%	19.90%	21.30%	23.30%
Income tax payments, net of refunds			$ 253.5	$ 165.6

Supplemental Information (Narra

Supplemental Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Disclosure Text Block Supplement [Abstract]
Net proceeds from sale of property	$ 44.1
Company headquarters relocation income (expense)	33.8	$ 0		$ 33.8	$ 0
Facility closure	0	0	$ 29	0	29
Related Party Transaction [Line Items]
Trade receivables, net	205			205		$ 130
Equity affiliate and joint venture partner
Related Party Transaction [Line Items]
Sales to and other income from related parties	$ 90	$ 80		$ 180	$ 165

Supplemental (Summary of Liabil

Supplemental (Summary of Liabilities Resulting from Related Party Transactions) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Related Party Transactions [Abstract]
Payables and accrued liabilities	$ 8.9	$ 8.9
Current portion of long-term debt	38.1	37.8
Long-term debt – related party	$ 323.1	$ 320.1

Business Segment Information (S

Business Segment Information (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales		$ 2,216.3	$ 2,187.7	$ 4,471	$ 4,411.7
Operating income (loss)		577.2	516.5	1,138.2	971.5
Depreciation and amortization				583.9	520.1
Equity affiliates' income		88.2	46.2	146.4	99.1
Total assets		19,501.2		19,501.2		$ 18,942.8
Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	2,216.3	2,187.7	4,471	4,411.7
Operating income (loss)	[2]	543.4	516.5	1,104.4	1,000.5
Depreciation and amortization		294.7	262.1	583.9	520.1
Equity affiliates' income		54.4	46.2	112.6	99.1
Total assets		19,501.2		19,501.2		18,942.8
Industrial Gases - Americas | Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	932.4	991.7	1,868.6	1,980.9
Operating income (loss)	[2]	268	255.6	525.2	474.8
Depreciation and amortization		135.5	124.9	267.3	250.5
Equity affiliates' income		21.6	17.8	42.2	40.4
Total assets		5,933.7		5,933.7		5,832.2
Industrial Gases - EMEA | Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	492.7	494.4	991.4	1,018.6
Operating income (loss)	[2]	124.6	122.5	245.1	228.1
Depreciation and amortization		47.6	46.3	96	92.6
Equity affiliates' income		13.5	13.3	32.8	27
Total assets		3,378.8		3,378.8		3,250.8
Industrial Gases - Asia | Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	658.1	625.4	1,350.9	1,252.2
Operating income (loss)	[2]	209.1	199.7	437.6	401.5
Depreciation and amortization		104.1	84.9	205.7	164.8
Equity affiliates' income		13.8	13.8	30.7	30
Total assets		6,489.7		6,489.7		6,240.6
Industrial Gases - Global | Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	79.3	53.8	171.9	122
Operating income (loss)	[2]	(19.8)	(12.2)	(16.2)	(8.3)
Depreciation and amortization		2.4	2	4.8	4.1
Equity affiliates' income		5.5	1.3	6.9	1.7
Total assets		438.1		438.1		325.7
Corporate and other | Operating Segments
Segment Reporting Information [Line Items]
Sales	[1]	53.8	22.4	88.2	38
Operating income (loss)	[2]	(38.5)	(49.1)	(87.3)	(95.6)
Depreciation and amortization		5.1	4	10.1	8.1
Equity affiliates' income		0	$ 0	0	$ 0
Total assets		$ 3,260.9		$ 3,260.9		$ 3,293.5
[1]	The sales information noted above relates to external customers only. All intersegment sales are eliminated in consolidation. Intersegment sales are generally transacted at market pricing. We generally do not have intersegment sales from our regional industrial gases businesses. Equipment manufactured for our regional industrial gases segments are generally transferred at cost and are not reflect as an intersegment sale.
[2]	Refer to the Reconciliations to Consolidated Results section below.

Business Segment Information (R

Business Segment Information (Reconciliation of Operating Income) (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Operating income		$ 577.2	$ 516.5		$ 1,138.2	$ 971.5
Facility closure		0	0	$ (29)	0	(29)
Company headquarters relocation income (expense)		33.8	0		33.8	0
Segment Total
Segment Reporting Information [Line Items]
Operating income	[1]	543.4	516.5		1,104.4	1,000.5
Segment Reconciling Items
Segment Reporting Information [Line Items]
Facility closure		0	0		0	(29)
Company headquarters relocation income (expense)		$ 33.8	$ 0		$ 33.8	$ 0
[1]	Refer to the Reconciliations to Consolidated Results section below.

Business Segment Information _2

Business Segment Information (Reconciliation of Equity Affiliates' Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Equity affiliates' income	$ 88.2	$ 46.2	$ 146.4	$ 99.1
India Finance Act 2020	33.8		33.8
Segment Total
Segment Reporting Information [Line Items]
Equity affiliates' income	54.4	46.2	112.6	99.1
Segment Reconciling Items
Segment Reporting Information [Line Items]
India Finance Act 2020	$ 33.8	$ 0	$ 33.8	$ 0