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Goodwill (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Oct. 01, 2014
Sep. 30, 2014
Mar. 31, 2015
Oct. 01, 2014
Goodwill [Line Items]        
Number of reporting units 13us-gaap_NumberOfReportingUnits      
Goodwill, net   $ 1,237.3us-gaap_Goodwill $ 1,155.4us-gaap_Goodwill  
Reporting unit goodwill as percent total assets     1.30%apd_RepUnitGoodwillAsPercentTotalAssets  
Latin America Reporting Unit [Member]        
Goodwill [Line Items]        
Reporting unit percentage of fair value in excess of carrying amount 10.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= apd_LatinAmericaReportingUnitMember
    10.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= apd_LatinAmericaReportingUnitMember
Goodwill impairment charge 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= apd_LatinAmericaReportingUnitMember
305.2us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= apd_LatinAmericaReportingUnitMember
   
Goodwill, net     $ 223.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= apd_LatinAmericaReportingUnitMember