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Noncontrolling Interests (Rollforward Redeemable Noncontrolling Interest) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Redeemable Noncontrolling Interest [Line Items]    
Balance, beginning of period $ 287.2us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 375.8us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Net income (loss) 5.4us-gaap_TemporaryEquityNetIncome 1.3us-gaap_TemporaryEquityNetIncome
Dividends 0apd_DividendsRedeemableNoncontrollingInterest (3.5)apd_DividendsRedeemableNoncontrollingInterest
Currency translation adjustment (3.9)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments (14.9)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Balance, end of period $ 288.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 358.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount