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Income Taxes (Activity Related To Our Gross Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 58.0us-gaap_UnrecognizedTaxBenefits $ 46.7us-gaap_UnrecognizedTaxBenefits $ 33.2us-gaap_UnrecognizedTaxBenefits
Additions for current year tax positions 11.4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 10.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 10.6us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for prior year tax positions 0.7us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 2.2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3.9us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for prior year tax positions (9.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 3.5us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Statute expirations (0.7)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (0.1)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1.2)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Foreign currency translation (0.7)mkc_UnrecognizedTaxBenefitsChangesResultingFromEffectsOfForeignCurrencyTranslations (1.1)mkc_UnrecognizedTaxBenefitsChangesResultingFromEffectsOfForeignCurrencyTranslations 0.2mkc_UnrecognizedTaxBenefitsChangesResultingFromEffectsOfForeignCurrencyTranslations
Balance at end of year $ 55.7us-gaap_UnrecognizedTaxBenefits $ 58.0us-gaap_UnrecognizedTaxBenefits $ 46.7us-gaap_UnrecognizedTaxBenefits