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Business Segment Information (Narratives) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Sales $ 2,560.8us-gaap_SalesRevenueNet $ 2,545.5us-gaap_SalesRevenueNet
Industrial Gases Global [Member]    
Segment Reporting Information [Line Items]    
Sales 59.0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		 67.2us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember
Industrial Gases Global [Member] | Intersegment Elimination [Member]    
Segment Reporting Information [Line Items]    
Sales $ 59.6us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		 $ 41.3us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember