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Summarized Financial Information of Equity Affiliates (Narratives) (Details)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
May 29, 2012
USD ($)
May 29, 2012
SAR
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Sep. 30, 2012
EquityMethodInvestmentsMember
USD ($)
Sep. 30, 2011
EquityMethodInvestmentsMember
USD ($)
Sep. 30, 2012
Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]
May 29, 2012
Abdullah Hashim Industrial Gas & Equipment Co. Ltd [Member]
Sep. 30, 2012
Air Products South Africa (Proprietary) Limited [Member]
Sep. 30, 2012
Bangkok Cogeneration Company Limited [Member]
Sep. 30, 2012
Bangkok Industrial Gases Co., Ltd. [Member]
Sep. 30, 2012
Chengdu Air & Gas Products Ltd. [Member]
Sep. 30, 2012
Daido Air Products Electronics, Inc. [Member]
Sep. 30, 2012
Helap Sa [Member]
Sep. 30, 2012
High-Tech Gases (Beijing) Co., Ltd. [Member]
Sep. 30, 2012
INFRA Group [Member]
Sep. 30, 2012
INOX Air Products Limited [Member]
Sep. 30, 2012
Kulim Industrial Gases Sdn. Bhd. [Member]
Sep. 30, 2012
Sapio Produzione Idrogeno Ossigeno Srl [Member]
Sep. 30, 2012
SembCorp Air Products (HyCo) Pte. Ltd. [Member]
Sep. 30, 2012
Tecnologia En Nitrogeno S De Rl De Cv [Member]
Sep. 30, 2012
Tyczka Industrie-Gases GmbH [Member]
Sep. 30, 2012
WuXi Hi-Tech Gas Co., Ltd. [Member]
Schedule of Equity Method Investment [Line Items]                                                
Payments to acquire interest in affiliates $ 155.0 581.3                                            
Investment in foreign affiliates     1,171.0 972.5                                        
Total goodwill associated with affiliate companies accounted for by equity method     1,598.4 796.2 816.9 126.4 62.6                                  
Ownership interest percentage acquired               25.00% 25.00% 50.00% 49.00% 49.00% 50.00% 20.00% 50.00% 50.00% 40.00% 50.00% 50.00% 49.00% 40.00% 50.00% 50.00% 50.00%
Dividends received from equity affiliates     $ 89.0 $ 105.9 $ 75.4