Number of units/shares granted Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Intangible assets Deferred Tax Liabilities, Intangible Assets Target allocation (percent) Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Aggregated intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Anticipated contributions for next fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Period of payment on deemed repatriation tax obligation (in years) Tax Cuts And Jobs Act Of 2017, Transition Tax For Accumulated Foreign Earnings, Period Of Installment Payments On Liability Tax Cuts And Jobs Act Of 2017, Transition Tax For Accumulated Foreign Earnings, Period Of Installment Payments On Liability Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party [Axis] Related Party [Axis] Current lease receivables Capital Leases, Lessor Balance Sheet, Net Investment in Direct Financing and Sales Type Leases, Current Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Number of hydrogen production plants acquired Number Of Facilities Acquired Number Of Facilities Acquired Cash and Cash items – Beginning of Year Cash and Cash Items – End of Period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations China CHINA Minimum Lease Payments Expected to be Collected Prior to Adoption of New Lease Guidance Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract] Liabilities and Equity LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Dividends to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Tax effect on net gain (loss) on derivatives Tax effects Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Cash Used for Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Thereafter Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five Security Exchange Name Security Exchange Name Eurobonds 0.50% due 2028 Eurobonds Point Five Percent [Member] Eurobonds Point Five Percent Germany Federal Ministry of Finance, Germany [Member] Fair value at beginning of year Fair Value at End of Year Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Long-term debt proceeds Proceeds from Issuance of Long-term Debt Total Current Liabilities Current liabilities Liabilities, Current Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Schedule of Operating Leases Schedule Of Right Of Use Assets and Lease Liabilities, Lessee [Table Text Block] Schedule Of Right Of Use Assets and Lease Liabilities, Lessee [Table Text Block] Outstanding, beginning (in dollars per share) Outstanding, ending (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Assets Assets [Abstract] Investment, Name [Axis] Schedule of Equity Method Investment, Equity Method Investee Name [Axis] Investment, Name [Axis] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Accounting Policies [Abstract] Accounting Policies [Abstract] Proceeds from investments Proceeds from Sale and Maturity of Other Investments Issuance of treasury shares for stock option and award plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Current portion of long-term debt due to related party Due to Related Parties, Current Use of cash for payments on operating leases Operating Lease, Payments Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Net transition liability Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Transition Asset (Obligation), before Tax 2021 Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months Translation adjustments, net of tax Net Amount Recognized in OCI Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Unconditional Purchase Obligations Disclosure Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] Net gain (loss) on derivatives, net of tax Net Amount Recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Guarantee Obligations By Name [Axis] Guarantee Obligations By Name [Axis] Acquired finite-lived intangible assets, weighted-average useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Euro Denominated Euro Denominated Member [Member] Euro Denominated Member [Member] Shares repurchased during period (shares) Treasury Stock, Shares, Acquired Foreign Currency Debt Debt Security, Corporate, Non-US [Member] Production facilities Manufacturing Facility [Member] Outstanding, beginning (shares) Outstanding, ending (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Chinese Renminbi 5.5% due 2021 to 2027 ChineseRenminbiFivePointFivePercent [Member] Chinese Renminbi 5.5% Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Unrecognized compensation costs Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Long-term debt Long-term Debt Long-term Debt and Lease Obligation New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] State Current State and Local Tax Expense (Benefit) Net Income Attributable to Air Products Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Tax credit carryforwards Tax Credit Carryforward, Amount Maximum potential payment under guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Percentage guaranteed share of loan Percent Loan Guarateed Percent Loan Guarateed Diluted EPS from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Buildings Building [Member] Other Comprehensive Income (Loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share 2023 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three Tax reform repatriation Tax Cuts And Jobs Act Of 2017, Tax Reform Repatriation Add back when calculating net cash generated by operating activities using the indirect method for the component of income tax expense for the period representing the increase in the entity's noncurrent income tax liability pertaining to continuing operations. Other noncurrent assets Deferred tax assets Deferred Income Tax Assets, Net 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Other noncurrent liabilities Other noncurrent liabilities Other Liabilities, Noncurrent Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Segment, Operating Activities Segment [Axis] Operating Activities [Axis] Operating Activities [Axis] Percentage of plan assets as component of total international plan assets Defined Benefit Plan, Plan Assets, Geographic Region Percent To Total International Plan Assets Percentage of plan assets for specific geographic region as a percent of total international plan assets. Accumulated Other Comprehensive Income (Loss) [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Effect of Exchange Rate Changes on Cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Segment Reconciling Items Segment Reconciling Items [Member] Inventories Inventories Inventory, Net Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Other Other Assets, Miscellaneous, Current Measurement Frequency [Domain] Measurement Frequency [Domain] Income From Continuing Operations Operating income Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Summary of Net Investment Hedge Activity [Abstract] Summary of Net Investment Hedge Activity [Abstract] Lease Receivables, net Capital Leases, Net Investment in Sales Type Leases Disclosure Text Block Supplement [Abstract] Disclosure Text Block Supplement [Abstract] Industrial Gases - EMEA Industrial Gases EMEA [Member] Industrial Gases - EMEA [Member] Exercisable period from grant date Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Statement [Line Items] Statement [Line Items] Class of Stock [Domain] Class of Stock [Domain] Interest rate, weighted average Long-term Debt, Weighted Average Interest Rate, at Point in Time Debt instrument, term Debt Instrument, Term Unearned interest income Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount Statement [Table] Statement [Table] 1.000% Euro Notes due 2025 Euro Notes Due 2025 One Percent [Member] Euro Notes Due 2025 One Percent [Member] Retirement benefits and compensation accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Write-offs charged against the allowance Accounts Receivable, Allowance for Credit Loss, Writeoff Interest cost Defined Benefit Plan, Interest Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Equity pooled funds Equity Funds [Member] Tax reform rate change and other Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Unremitted earnings of foreign entities Deferred Tax Liabilities, Undistributed Foreign Earnings Carrying amount of hedged item Hedged Liability, Fair Value Hedge Amount reclassified from OCI into income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Retirement Plan Funding Status [Domain] Defined Benefit Plan, Funding Status [Domain] Entity Small Business Entity Small Business Domestic production activities Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Unconditional purchase obligation Total Unrecorded Unconditional Purchase Obligation Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Sales/Cost of sales Sales/cost of sales For purposes of disclosing affected line items on the consolidated income statements, combined line items sales and cost of sales. Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Prepaid expenses Prepaid Expense, Current Forward Exchange Contracts, Excluded Component Forward Contracts, Excluded Component [Member] Forward Contracts, Excluded Component [Member] Cash provided by financing activities Cash Provided by (Used in) Financing Activities, Discontinued Operations Share-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent Amendment Flag Amendment Flag Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Gross Deferred Tax Assets Deferred Tax Assets, Gross [Abstract] Shares available for future grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Note 1.50% due 2026 Senior Note One Point Five Percent [Member] Senior Note One Point Five Percent Chengdu Air & Gas Products Ltd. Chengdu Air & Gas Products Ltd. [Member] Derivatives, net ox tax Net (Gain) Loss Reclassified from OCI to Income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Schedule of Lease Receivables Sales-type and Direct Financing Leases, Lease Receivable, Maturity [Table Text Block] Cost Reduction Actions Restructuring and Related Activities Disclosure [Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] Goodwill, Impaired, Accumulated Impairment Loss [Abstract] High-Tech Gases (Beijing) Co., Ltd. High-Tech Gases (Beijing) Co., Ltd. [Member] U.K. UNITED KINGDOM Trade Receivables, net Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Discontinued Operations Net Cash Provided by (Used in) Discontinued Operations [Abstract] Accrual for environmental loss contingencies, maximum payout period Site Contingency, Time Frame of Disbursements Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Carrying Values and Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Equity Investments Equity Method Investments [Policy Text Block] Total (Gain) Loss Recognized in Income Derivative, Gain (Loss) on Derivative, Net Fair Value Measurement [Domain] Fair Value Measurement [Domain] Purchase Commitments for Plant and Equipment Capital Addition Purchase Commitments [Member] Financial Instruments Derivatives, Policy [Policy Text Block] Noncurrent customer liability Long Term Customer Payable, Noncurrent The amounts due to customers for utilities used in the normal course of business for a sum of money expected to be payable at a future date more than one year from the balance sheet date. Lease payments collected during the period Proceeds from Lease Payment, Operating Activity Guarantee Obligations By Name [Domain] Guarantee Obligations By Name [Domain] Litigation Commitments and Contingencies, Policy [Policy Text Block] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Schedule of Deferred Stock Units and Restricted Stock Activity Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax Discount rate – Interest cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate For Interest Cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate For Interest Cost Income Statement Location [Domain] Income Statement Location [Domain] Amount excluded from effectiveness testing recognized in earnings based on amortization approach Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax U.S. State State and Local Jurisdiction [Member] Selling and administrative Selling, General and Administrative Expense Amount reclassified from OCI into income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Provisional tax expense for deemed repatriation tax Tax Cuts and Jobs Act Of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense1 Tax Cuts and Jobs Act Of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense1 0.800% Notes due 2032 0.800% Notes due 2032 [Member] 0.800% Notes due 2032 Total Long-term Debt Long-term Debt and Lease Obligation, Including Current Maturities Other noncurrent assets Other noncurrent assets Other Assets, Noncurrent 2024 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four Net income from continuing operations Income from continuing operations attributable to Air Products Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Total Assets Total assets Assets Outstanding, beginning (shares) Outstanding, ending (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] WuXi Hi-Tech Gas Co., Ltd. WuXi Hi-Tech Gas Co., Ltd. [Member] Piedmont, South Carolina Piedmont, South Carolina [Member] Piedmont, South Carolina [Member] Total U.S. Qualified Pension Plans at Fair Value US Pension Plans At Fair Value [Member] US Pension Plans At Fair Value [Member] Prior service cost amortization Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2023 Capital Leases, Future Minimum Payments, Receivable in Four Years Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Cost of Sales Cost of Sales [Member] Schedule of Common Stock Outstanding Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Schedule of Other Noncurrent Assets Schedule of Other Assets, Noncurrent [Table Text Block] Site Environmental Contingency, Nature of Contingency [Domain] Environmental Remediation Site [Domain] Long-term deposits on plant and equipment Long-Term Deposit On Property And Equipment Long-Term Deposit On Property And Equipment Leases Lessor, Sales-type Leases [Text Block] Other Other Intangible Assets [Member] Kulim Industrial Gases Sdn. Bhd. Kulim Industrial Gases Sdn. Bhd. [Member] Total Liabilities Liabilities Contingencies related to uncertain tax positions Liability for Uncertainty in Income Taxes, Noncurrent Merchant Merchant [Member] Merchant [Member] Maximum of loss contingency range subject to interest Loss Contingency Range Of Possible Loss Maximum Subject To Interest The estimated maximum amount of possible loss from contingency related to legal matter(s), excluding interest to be accrued thereon. Approximate number of sites on which settlement has not been reached Sites on which final settlement has not been reached Environmental sites on which a final settlement has not been reached where, along with others, the Company has 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 the Company's current and former manufacturing sites Sales Sales [Member] Schedule of Amounts Recognized in Other Comprehensive Income (Loss) Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Civil fines imposed Loss Contingency, Damages Sought, Value Retirement Plan Type [Axis] Retirement Plan Type [Axis] ABO for all defined benefit pension plans Defined Benefit Plan, Accumulated Benefit Obligation Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Participant contributions Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Jazan Gas Projects Company Jazan [Member] Jazan [Member] Interest and penalties related to unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Level 1 Fair Value, Inputs, Level 1 [Member] Thereafter Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Total Capital Leases, Future Minimum Payments Receivable Tax expense for deemed repatriation tax Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense Inventories Increase (Decrease) in Inventories 2022 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two Supplemental Information Supplemental Information [Text Block] Additional balance sheet, income statement, and cash flow information. Includes disclosure of unusual or material transactions not applicable to other specific notes. Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Other working capital Increase (Decrease) in Other Operating Assets and Liabilities, Net Capital in Excess of Par Value Additional Paid-in Capital [Member] Other adjustments Other Operating Activities, Cash Flow Statement Other Other Assets, Miscellaneous, Noncurrent Basic EPS from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Decrease in operating loss carryforwards Decrease In Operating Loss Carryforwards Decrease In Operating Loss Carryforwards Distribution and other machinery and equipment Machinery and Equipment [Member] Schedule of Other Receivables and Current Assets Schedule of Other Current Assets [Table Text Block] Common stock, shares outstanding Balance, beginning of year (shares) Balance, end of year (shares) Common Stock, Shares, Outstanding Deferred Tax Assets Deferred Tax Assets, Net [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Income From Continuing Operations Before Taxes Change in inventory valuation method Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Purchases, sales, and settlements, net Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Outstanding, beginning (in dollars per share) Outstanding, ending (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Common stock, authorized shares Common Stock, Shares Authorized Acquisitions, less cash acquired Payments to Acquire Businesses, Net of Cash Acquired Interest acquired in exchange transaction (percent) Business Acquisition, Percentage of Voting Interests Acquired Employee stock option and other award plans Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Plant and equipment, at cost Property, Plant and Equipment, Gross Proceeds from stock option exercises Cash received from option exercises Proceeds from Stock Options Exercised Variable-rate industrial revenue bonds 0.1% due 2035 to 2050 Variable Rate Industrial Revenue Bonds Point One Percent [Member] Variable rate industrial revenue bonds 0.1% Federal Deferred Federal Income Tax Expense (Benefit) 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Other pooled funds Other Pooled Funds [Member] Other pooled funds. Gain on exchange of equity affiliate investments Net Gain (Loss) On Exchange Of Equity Affiliate Investments Net Gain (Loss) On Exchange Of Equity Affiliate Investments Special termination benefits Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits Schedule of Segment Reporting Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Funded Status at End of Year Defined Benefit Plan, Funded (Unfunded) Status of Plan Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Income Statement [Abstract] Income Statement [Abstract] 2025 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Accumulated Other Comprehensive Income (Loss) AOCL attributable to Air Products AOCI Attributable to Parent [Member] Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Cash used for operating activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Schedule of Change in Accounting Estimate [Table] Schedule of Change in Accounting Estimate [Table] Deferred financing charges and discounts Less: Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Income Tax Authority [Domain] Income Tax Authority [Domain] Taiwan Tax Authority, Taiwan [Member] Tax Authority, Taiwan [Member] Actual return on plan assets: Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unearned interest income Capital Leases, Net Investment in Sales Type Leases, Deferred Income Schedule of Assumptions Used in The Calculation of Net Periodic Pension Cost and PBO Defined Benefit Plan, Assumptions [Table Text Block] Computer software costs Software and Software Development Costs [Member] Provisional tax expense for deemed repatriation tax and additional foreign taxes on repatriation of earnings Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax And Additional Foreign Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Amount of reasonable estimate for income tax expense from transition tax and additional foreign tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act for which accounting for tax effect is incomplete. Indefinite-lived intangible assets, gross Indefinite-Lived Intangible Assets, Gross Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life. Schedule of Changes in Fair Value of Plan Assets Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Spain Tax Authority, Spain [Member] Change in Inventory Valuation Method Inventory Valuation Method [Member] Inventory Valuation Method [Member] Additions to plant and equipment, including long-term deposits Additions to plant and equipment Expenditures for long-lived assets Payments to Acquire Property, Plant, and Equipment Consolidation Items [Domain] Consolidation Items [Domain] Tax credits and other tax carryforwards Deferred Tax Assets, Tax Credit Carryforwards Amount before allocation of valuation allowances of deferred tax asset attributable to tax credits and other tax carryforwards. Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Discrete net tax expense related to Tax Act Tax Cuts and Jobs Act, Income Tax Expense (Benefit) Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Abdullah Hashim Industrial Gases & Equipment Co., Ltd. Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member] Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Percentage of remaining performance obligation Revenue, Remaining Performance Obligation, Percentage Equity affiliates' income Income (Loss) from Equity Method Investments Actual allocation (percent) Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Hedging Designation [Axis] Hedging Designation [Axis] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 2025 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five 2026-2030 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Debenture 8.75% due 2021 Debentures Eight Point Seven Five Percent [Member] Debentures 8.75% Schedule of Components of Inventories Schedule of Inventory, Current [Table Text Block] Entity [Domain] Entity [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Unfunded Plan Defined Benefit Plan, Unfunded Plan [Member] Business combinations, goodwill acquired during period Acquisitions Goodwill, Acquired During Period Other Comprehensive Loss Attributable to Noncontrolling Interests Amount attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Summary by Quarter (Unaudited) Quarterly Financial Information [Text Block] Impact of tax holidays (in dollars per share) Income Tax Holiday, Income Tax Benefits Per Share Provisional tax benefit for re-measurement of net U.S. deferred tax liabilities at lower corporate tax rate Tax Cuts and Jobs Act Of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit1 Tax Cuts and Jobs Act Of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit1 Schedule of Effects of Derivatives Not Designated as a Hedging Instrument Derivatives Not Designated as Hedging Instruments [Table Text Block] Intangible Assets Intangible Assets Disclosure [Text Block] Property and equipment, useful life Useful life (in years) Property, Plant and Equipment, Useful Life Loans Payable Loans Payable [Member] Goodwill [Line Items] Goodwill [Line Items] Schedule of Deferred Tax Assets for Certain Tax Credits Schedule Of Deferred Tax Assets For Tax Credits [Table Text Block] Schedule Of Deferred Tax Assets For Tax Credits [Table Text Block] Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] 2020 Operating Leases, Future Minimum Payments Due, Next Twelve Months Total Debt Debt and Lease Obligation Note 2.70% due 2040 Senior Note Two Point Seven Percent [Member] Senior Note Two Point Seven Percent Finite-lived intangible assets, residual value Acquired Finite-lived Intangible Asset, Residual Value Final audit settlement related to unrecognized tax benefits Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Series of Individually Immaterial Business Acquisitions Series of Individually Immaterial Business Acquisitions [Member] Sale of Equipment Sale of Equipment [Member] Sale of Equipment [Member] Restricted Stock Restricted Stock [Member] Discontinued Operations, Held-for-sale or Disposed of by Sale Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Total Amount Recognized in OCI Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax Schedule of Changes in Carrying Amount of Allowance for Doubtful Accounts Accounts Receivable, Allowance for Credit Loss [Table Text Block] Land Land [Member] Operating lease liabilities, payables and accrued liabilities Current lease obligations Operating Lease, Liability, Current Short-term debt, weighted average interest rate Short-term Debt, Weighted Average Interest Rate, at Point in Time Indefinite tax credit carryforwards Tax Credit Carryforward, Not Subject To Expiration The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, not subject to expiration. 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Bangkok Industrial Gases Co., Ltd. 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Total Gain (Loss) Recognized in Income Gain (Loss) on Fair Value Hedges Recognized in Earnings Rent expense under operating leases Operating Leases, Rent Expense, Net Amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Total Liabilities and Equity Liabilities and Equity Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of business combinations completed in period Number of Businesses Acquired Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Total Noncurrent Liabilities Noncurrent liabilities Liabilities, Noncurrent Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Acquisitions Acquisitions Disclosure [Text Block] The combined disclosure for acquisitions completed during the period. Statute of limitations expiration Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Hedging Relationship [Axis] Hedging Relationship [Axis] Gross Deferred Tax Liabilities Deferred Tax Liabilities, Gross [Abstract] Cumulative undistributed earnings Undistributed Earnings of Foreign Subsidiaries Antidilutive options excluded from computation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total Current Tax Provision Current Income Tax Expense (Benefit) Cash Provided by Discontinued Operations Net Cash Provided by (Used in) Discontinued Operations Noncurrent lease receivables Net Investment in Lease, Noncurrent Additions for tax positions of the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Finite-lived intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Derivative instruments Derivative Asset, Noncurrent Number of positions eliminated or expected to be eliminated Restructuring And Related Cost, Total Number Of Positions Eliminated Or Expected To Be Eliminated The number of positions eliminated during the period or expected to be eliminated as a result of restructuring activities. Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Sales less cost of sales Gross profit Gross Profit Plant and equipment, net Plant and equipment, net Long-Lived Assets Property, Plant and Equipment, Net (Gain) Loss Effects of Cash Flow Hedging: Effect of Cash Flow Hedges on Results of Operations [Abstract] Entity Tax Identification Number Entity Tax Identification Number Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Currency translation and other Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Share-Based Compensation Share-based Payment Arrangement [Text Block] Interest Rate Management Contracts Interest Rate Contract [Member] Net Income Attributable to Air Products Net income (loss) attributable to Air Products Net Income Attributable to Air Products Net Income (Loss) Attributable to Parent Working capital changes that provided (used) cash, excluding effects of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Inventories Inventory Disclosure [Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Land Use Rights Use Rights [Member] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Tax effect on derivatives reclassification adjustments Tax effects Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Thereafter Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five Business combinations, recognized identifiable intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] France Ministry of the Economy, Finance and Industry, France [Member] Pace, Florida Pace, Florida [Member] Pace, Florida [Member] Payable in Euro Euro Member Countries, Euro Contract liabilities - noncurrent Contract liabilities Contract with Customer, Liability, Noncurrent Foreign Line of Credit Foreign Line of Credit [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Estimate of possible exposure from environment loss contingencies Loss Contingency, Estimate of Possible Loss Other Other Sundry Liabilities, Noncurrent Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Schedule of Major Classes of Plant and Equipment Property, Plant and Equipment [Table Text Block] Forfeited/adjustments (shares) ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresAndPerformanceChangeInPeriod The increase or decrease in the number of equity-based payment instruments, excluding stock (or unit) options, attributable to forfeitures and changes in performance during the reporting period Series E 7.6% due 2026 Medium Term Notes Seven Point Six Percent [Member] Medium term notes 7.6% Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Minimum Payments Due on Operating Leases Prior to Adoption of New Lease Guidance Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Shares of common stock in ESOP Employee Stock Ownership Plan (ESOP), Shares in ESOP Fair value of plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Other Income (Expense), Net Other Operating Income (Expense) [Member] Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 2024 Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Contract assets - current Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Currency [Axis] Currency [Axis] Net actuarial loss on pretax basis Net actuarial loss Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Pension Plans with PBO in Excess of Plan Assets: Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] Hedging Relationship [Domain] Hedging Relationship [Domain] Environmental Environmental Issue [Member] Schedule of Maturity Analysis of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Industrial Gases - Asia Industrial Gases Asia [Member] Industrial Gases - Asia [Member] Basic Weighted average common shares — Basic Weighted Average Number of Shares Outstanding, Basic Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Schedule of Cumulative Basis Adjustments for Fair Value Hedges Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Investment in net assets of and advances to equity affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Ownership [Axis] Ownership [Axis] Cash Flow Hedges Cash Flow Hedging [Member] 2022 Capital Leases, Future Minimum Payments, Receivable in Three Years Loss Contingencies [Table] Loss Contingencies [Table] Schedule of Minimum Payments Due Under Leases at Prior Year End Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Carrying Value Reported Value Measurement [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Dividends payable Dividends Payable Revenue Recognition Revenue from Contract with Customer [Text Block] Ownership interest percentage Equity Method Investment, Ownership Percentage Time-Based Deferred Stock Unit Time Based Deferred Stock Unit [Member] Time-Based Deferred Stock Unit [Member] Netherlands Tax and Customs Administration, Netherlands [Member] Amortization of net actuarial loss Amortization of net actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax ROU asset additions Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Actuarial loss (gain) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Long-term debt, including current portion fair value Long-term Debt, Fair Value Cash and Cash Items Cash and Cash Equivalents, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Income tax provision Total Income Tax Provision Income Tax Expense (Benefit) 2024 Operating Leases, Future Minimum Payments, Due in Five Years Impact of tax holidays Income Tax Holiday, Aggregate Dollar Amount Plant and Equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Deemed repatriation tax obligation in noncurrent liabilities Long-term accrued income taxes related to U.S. tax reform Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Foreign Subsidiary Facility Foreign Subsidiary Facility [Member] Gain from disposal of interest in equity method investment Equity Method Investment, Realized Gain (Loss) on Disposal Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Currency translation and other Goodwill, Translation and Purchase Accounting Adjustments Local Phone Number Local Phone Number Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Note 3.0% due 2022 Senior Note Three Percent [Member] Senior Note 3.0% Intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Derivative [Line Items] Derivative [Line Items] Accrual for environmental loss contingencies Accrual for Environmental Loss Contingencies Schedule of Indefinite-Lived Intangible Assets Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Derivatives qualifying as hedges (Gain) Loss on Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Long-term Debt, gross Total Long-term Debt, Gross Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] After-tax share-based compensation cost Share-based Payment Arrangement, Expense, after Tax Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] 0.500% Notes due 2028 0.500% Notes due 2028 [Member] 0.500% Notes due 2028 Tax effect on derivatives reclassification adjustments Tax effects Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Selling and Administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] PBO in excess of plan assets Defined Benefit Plan, Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets, Projected Benefit Obligation In Excess Of Plan Assets Amount of projected benefit obligation in excess of plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity U.S. Federal Internal Revenue Service (IRS) [Member] Award Type [Axis] Award Type [Axis] Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Fair value of vested restricted stock Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Raw materials, supplies and other Inventory, Raw Materials and Supplies, Gross Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Schedule of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Accumulated impairment Accumulated Impairment Amount of accumulated impairment loss relating to indefinite-lived intangibles. Major Accounting Policies Significant Accounting Policies [Text Block] Purchases of investments Payments to Acquire Investments Weighted average remaining contractual terms, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Contracts accounted for under percentage of completion Contracts Accounted for under Percentage of Completion [Member] Total Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received Award Type [Domain] Award Type [Domain] Pension and postretirement benefits Accrued liabilities Liability, Defined Benefit Plan, Current Summary of Carrying Amount of Accrual for Cost Reduction Actions Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Industrial Gases - Americas Industrial Gases Americas [Member] Industrial Gases - Americas [Member] Expected lease payments for operating leases that have not yet commenced Operating Lease, Expected Future Minimum Payments, Lease Not Yet Commenced Operating Lease, Expected Future Minimum Payments, Lease Not Yet Commenced Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Net liability position of derivatives with credit risk-related contingent features Derivative, Net Liability Position, Aggregate Fair Value Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Plant and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Continuing Operations Continuing Operations [Member] Treasury stock, at cost Treasury Stock, Value Earnings Per Share Earnings Per Share [Text Block] Defined Benefit Pension Plan Pension Plan [Member] Capitalized interest Accumulated Capitalized Interest Costs Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2021 Capital Leases, Future Minimum Payments, Receivable in Two Years Current Liabilities Liabilities, Current [Abstract] U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Accretion expense Asset Retirement Obligation, Accretion Expense Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Summary of Cash Flow Hedge Activity [Abstract] Summary of Cash Flow Hedge Activity [Abstract] Interest income on lease receivables Sales-type Lease, Interest Income, Lease Receivable Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Per Share Data Earnings Per Share, Basic [Abstract] Short-term investments Short-term Investments