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Summary of Under-Funded or Non-Funded Pension Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets (Detail) (Non Funded Pension Benefit Plans, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Non Funded Pension Benefit Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 369.0us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jah_NonFundedPensionBenefitPlansMember		 $ 368.6us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jah_NonFundedPensionBenefitPlansMember
Fair value of plan assets $ 284.5us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jah_NonFundedPensionBenefitPlansMember		 $ 284.4us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jah_NonFundedPensionBenefitPlansMember