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Activity related to Unrecognized Tax Benefit (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Unrecognized Tax Benefits [Line Items]    
Unrecognized tax benefits $ 88.9us-gaap_UnrecognizedTaxBenefits $ 68.3us-gaap_UnrecognizedTaxBenefits
Acquisitions 5.2jah_UnrecognizedTaxBenefitsResultingFromAcquisitions 3.5jah_UnrecognizedTaxBenefitsResultingFromAcquisitions
Tax positions taken during the current period 48.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 27.6us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Tax positions taken during a prior period 3.7us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (2.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements with taxing authorities (0.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (7.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Other (0.1)jah_UnrecognizedTaxBenefitsChangesOther (0.1)jah_UnrecognizedTaxBenefitsChangesOther
Unrecognized tax benefits, December 31, $ 145.3us-gaap_UnrecognizedTaxBenefits $ 88.9us-gaap_UnrecognizedTaxBenefits