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Noncontrolling Interests (Rollforward Redeemable Noncontrolling Interest) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Redeemable Noncontrolling Interest [Line Items]        
Balance, beginning of period $ 288.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 358.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 287.2us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 375.8us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Net income (loss) 0us-gaap_TemporaryEquityNetIncome 0.7us-gaap_TemporaryEquityNetIncome 5.4us-gaap_TemporaryEquityNetIncome 2.0us-gaap_TemporaryEquityNetIncome
Dividends 0apd_DividendsRedeemableNoncontrollingInterest 0apd_DividendsRedeemableNoncontrollingInterest 0apd_DividendsRedeemableNoncontrollingInterest (3.5)apd_DividendsRedeemableNoncontrollingInterest
Currency translation adjustment (8.7)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments (15.8)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments (12.6)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments (30.7)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Balance, end of period $ 280.0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 343.6us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 280.0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 343.6us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount