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Goodwill (Schedule of Goodwill by Segment) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance $ 1,237.3us-gaap_Goodwill  
Goodwill, Acquisitions and Adjustments 5.4us-gaap_GoodwillAcquiredDuringPeriod  
Goodwill, Currency Translation and Other (87.3)us-gaap_GoodwillTranslationAdjustments  
Goodwill, net, Ending Balance 1,155.4us-gaap_Goodwill  
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, gross 1,427.6us-gaap_GoodwillGross 1,522.1us-gaap_GoodwillGross
Goodwill, Accumulated impairment losses (272.2)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss [1] (284.8)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss [1]
Goodwill, net 1,155.4us-gaap_Goodwill  
Industrial Gases - Americas [Member]    
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance 327.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		  
Goodwill, Acquisitions and Adjustments 2.2us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		  
Goodwill, Currency Translation and Other (9.8)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		  
Goodwill, net, Ending Balance 319.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		 327.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, net 319.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		 327.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember
Goodwill, Accumulated impairment losses currency translation 33.0apd_GoodwillAccumulatedImpairmentLossesCurrencyTranslationAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember		 20.4apd_GoodwillAccumulatedImpairmentLossesCurrencyTranslationAdjustment
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAmericasMember
Industrial Gases - EMEA [Member]    
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance 433.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesEmeaMember		  
Goodwill, Acquisitions and Adjustments 3.2us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesEmeaMember		  
Goodwill, Currency Translation and Other (58.5)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesEmeaMember		  
Goodwill, net, Ending Balance 378.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesEmeaMember		  
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, net 378.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesEmeaMember		  
Industrial Gases - Asia [Member]    
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance 140.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAsiaMember		  
Goodwill, Acquisitions and Adjustments 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAsiaMember		  
Goodwill, Currency Translation and Other (4.0)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAsiaMember		  
Goodwill, net, Ending Balance 136.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAsiaMember		  
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, net 136.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesAsiaMember		  
Industrial Gases - Global [Member]    
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance 21.4us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		  
Goodwill, Acquisitions and Adjustments 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		  
Goodwill, Currency Translation and Other (1.2)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		  
Goodwill, net, Ending Balance 20.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		  
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, net 20.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_IndustrialGasesGlobalMember		  
Materials Technologies [Member]    
Goodwill [Roll Forward]    
Goodwill, net, Beginning Balance 315.4us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_MaterialsTechnologiesMember		  
Goodwill, Acquisitions and Adjustments 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= apd_MaterialsTechnologiesMember		  
Goodwill, Currency Translation and Other (13.8)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= apd_MaterialsTechnologiesMember		  
Goodwill, net, Ending Balance 301.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_MaterialsTechnologiesMember		  
Goodwill Impaired Accumulated Impairment Loss Abstract    
Goodwill, net $ 301.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_MaterialsTechnologiesMember		  
[1]
Amount is attributable to the Industrial Gases – Americas segment and includes currency translation of $33.0 and $20.4 as of 31 March 2015 and 30 September 2014, respectively.