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Fair Value Measurements (Financial Assets And Liabilities Carried At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, assets $ 257.5us-gaap_AvailableForSaleSecurities $ 385.2us-gaap_AvailableForSaleSecurities
Deferred compensation plans, liabilities 75.0dhr_FairValueMeasuredOnRecurringBasisDeferredCompensationPlans 70.1dhr_FairValueMeasuredOnRecurringBasisDeferredCompensationPlans
Quoted Prices in Active Market (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, assets 257.5us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 385.2us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plans, liabilities $ 75.0dhr_FairValueMeasuredOnRecurringBasisDeferredCompensationPlans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 70.1dhr_FairValueMeasuredOnRecurringBasisDeferredCompensationPlans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member