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Supplemental Information (Debt) (Narrative) (Details)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 10, 2015
Eurobond 3.875% [Member]
USD ($)
Mar. 10, 2015
Eurobond 3.875% [Member]
EUR (€)
Mar. 31, 2015
Eurobond 1.0% [Member]
USD ($)
Mar. 31, 2015
Eurobond 1.0% [Member]
EUR (€)
Debt Instrument [Line Items]        
Debt instrument, issuance date     Feb. 12, 2015 Feb. 12, 2015
Interest rate of debt, stated percentage 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondThreePointEightSevenFivePercentMember		 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondThreePointEightSevenFivePercentMember		 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondOnePercentMember		 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondOnePercentMember
Debt instrument, principal amount $ 335.9us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondThreePointEightSevenFivePercentMember		 € 300.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondThreePointEightSevenFivePercentMember		 $ 335.3us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondOnePercentMember		 € 300.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= apd_EurobondOnePercentMember
Debt instrument, maturity date Mar. 10, 2015 Mar. 10, 2015 Feb. 12, 2025 Feb. 12, 2025