Summarized Financial Information of Equity Affiliates (Investment Listing) (Details)	Sep. 30, 2012	May 29, 2012
Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	25.00%	25.00%
Air Products South Africa (Proprietary) Limited [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
Bangkok Cogeneration Company Limited [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	49.00%
Bangkok Industrial Gases Co., Ltd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	49.00%
Chengdu Air & Gas Products Ltd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
Daido Air Products Electronics, Inc. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	20.00%
Helap S.A. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
High-Tech Gases (Beijing) Co., Ltd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
INFRA Group [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	40.00%
INOX Air Products Limited [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
Kulim Industrial Gases Sdn. Bhd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
Sapio Produzione Idrogeno Ossigeno S.r.l. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	49.00%
SembCorp Air Products (HyCo) Pte. Ltd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	40.00%
Tecnologia en Nitrogeno S. de R.L. de C.V. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
Tyczka Industrie-Gases GmbH [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%
WuXi Hi-Tech Gas Co., Ltd. [Member]
Schedule of Equity Method Investment [Line Items]
Ownership interest percentage acquired	50.00%