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Business Segment Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Business Segments                      
Number of Reportable Segments                 4us-gaap_NumberOfReportableSegments    
Segment Reporting Information [Line Items]                      
Revenues $ 4,492.8us-gaap_Revenues $ 4,171.4us-gaap_Revenues $ 4,321.9us-gaap_Revenues $ 3,903.5us-gaap_Revenues $ 3,466.9us-gaap_Revenues $ 3,191.8us-gaap_Revenues $ 3,240.1us-gaap_Revenues $ 3,191.5us-gaap_Revenues $ 16,889.6us-gaap_Revenues $ 13,090.3us-gaap_Revenues $ 12,509.9us-gaap_Revenues
Cost of revenues charges                 (327.6)tmo_CostOfRevenuesCharges (28.6)tmo_CostOfRevenuesCharges (55.6)tmo_CostOfRevenuesCharges
Selling, general and administrative charges, net                 (130.7)tmo_SellingGeneralAndAdministrativeChargesNet (73.5)tmo_SellingGeneralAndAdministrativeChargesNet (12.5)tmo_SellingGeneralAndAdministrativeChargesNet
Restructuring and other income (costs), net                 598.2tmo_RestructuringAndOtherCostsIncomeNet (77.7)tmo_RestructuringAndOtherCostsIncomeNet (82.1)tmo_RestructuringAndOtherCostsIncomeNet
Amortization of acquisition-related intangible assets                 (1,330.0)us-gaap_AmortizationOfIntangibleAssets (763.1)us-gaap_AmortizationOfIntangibleAssets (747.6)us-gaap_AmortizationOfIntangibleAssets
Operating Income                 2,503.0us-gaap_OperatingIncomeLoss 1,609.6us-gaap_OperatingIncomeLoss 1,482.1us-gaap_OperatingIncomeLoss
Other expense, net                 (415.8)tmo_OtherIncomeExpenseNet (290.1)tmo_OtherIncomeExpenseNet (212.7)tmo_OtherIncomeExpenseNet
Income from Continuing Operations Before Income Taxes                 2,087.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,319.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,269.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Depreciation                 353.1us-gaap_Depreciation 236.8us-gaap_Depreciation 236.1us-gaap_Depreciation
Total Assets 42,852.1us-gaap_Assets       31,863.4us-gaap_Assets       42,852.1us-gaap_Assets 31,863.4us-gaap_Assets 27,444.6us-gaap_Assets
Capital Expenditures                 427.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 282.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 315.1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Life Sciences Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Cost of revenues charges                 (327.3)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
0tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
(0.7)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Selling, general and administrative charges, net                 (122.5)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
(51.7)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
 
Restructuring and other income (costs), net                 516.4tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
(4.4)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
(7.8)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Total Assets 19,257.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
      1,115.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
      19,257.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
1,115.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
1,115.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Capital Expenditures                 104.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
19.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
26.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Analytical Instruments [Member]                      
Segment Reporting Information [Line Items]                      
Cost of revenues charges                 0.8tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
(2.9)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
(0.4)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Selling, general and administrative charges, net                 (0.9)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
(0.6)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
0.1tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Restructuring and other income (costs), net                 (2.5)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
(20.9)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
(32.8)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Total Assets 4,133.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
      4,321.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
      4,133.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
4,321.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
4,304.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Capital Expenditures                 38.1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
33.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
42.0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Specialty Diagnostics [Member]                      
Segment Reporting Information [Line Items]                      
Cost of revenues charges                 (0.9)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(24.9)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(52.8)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Selling, general and administrative charges, net                 (1.5)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(12.9)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(13.7)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Restructuring and other income (costs), net                 (17.7)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(24.2)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
(15.0)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Total Assets 8,047.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
      9,086.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
      8,047.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
9,086.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
9,841.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Capital Expenditures                 84.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
77.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
97.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Laboratory Products and Services [Member]                      
Segment Reporting Information [Line Items]                      
Cost of revenues charges                 (0.2)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
(0.8)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
(1.7)tmo_CostOfRevenuesCharges
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Selling, general and administrative charges, net                   0tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
0.9tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Restructuring and other income (costs), net                 121.0tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
(25.2)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
(25.5)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Total Assets 10,875.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
      11,523.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
      10,875.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
11,523.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
11,531.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Capital Expenditures                 102.1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
94.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
112.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Total Assets 538.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1]       5,817.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1]       538.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1] 5,817.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1] 651.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1]
Capital Expenditures                 98.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
57.0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
36.0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Total Reportable Segments [Member]                      
Segment Reporting Information [Line Items]                      
Operating Income                 3,694.8us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
[2] 2,552.5us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
[2] 2,379.9us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
[2]
Total Reportable Segments [Member] | Life Sciences Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 4,195.7us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
712.5us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
658.8us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Operating Income                 1,214.9us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
[2] 169.7us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
[2] 154.8us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
[2]
Depreciation                 131.6us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
17.1us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
16.8us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LifeSciencesSolutionsMember
Total Reportable Segments [Member] | Analytical Instruments [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 3,252.2us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
3,154.2us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
3,114.7us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Operating Income                 581.1us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
[2] 558.7us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
[2] 554.6us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
[2]
Depreciation                 39.0us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
41.2us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
42.5us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_AnalyticalTechnologiesMember
Total Reportable Segments [Member] | Specialty Diagnostics [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 3,343.6us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
3,191.7us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
2,961.5us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Operating Income                 916.0us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
[2] 863.7us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
[2] 758.1us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
[2]
Depreciation                 76.7us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
73.9us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
72.9us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_SpecialtyDiagnosticsMember
Total Reportable Segments [Member] | Laboratory Products and Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 6,601.5us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
6,398.8us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
6,102.8us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Operating Income                 982.8us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
[2] 960.4us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
[2] 912.4us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
[2]
Depreciation                 105.8us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
104.6us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
103.9us-gaap_Depreciation
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmo_LaboratoryProductsAndServicesMember
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 (503.4)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(366.9)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(327.9)us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Segment Reconciling Items [Member]                      
Segment Reporting Information [Line Items]                      
Cost of revenues charges                 (327.6)tmo_CostOfRevenuesCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(28.6)tmo_CostOfRevenuesCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(55.6)tmo_CostOfRevenuesCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Selling, general and administrative charges, net                 (130.7)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(73.5)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(12.5)tmo_SellingGeneralAndAdministrativeChargesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Restructuring and other income (costs), net                 598.2tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(77.7)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(82.1)tmo_RestructuringAndOtherCostsIncomeNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Amortization of acquisition-related intangible assets                 $ (1,331.7)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
$ (763.1)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
$ (747.6)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
[1]
Corporate assets consist primarily of cash and cash equivalents, short-term investments, property and equipment at the company's corporate offices and assets of the discontinued operations.
[2]
Represents operating income before certain charges to cost of revenues and selling, general and administrative expenses; restructuring and other costs, net; and amortization of acquisition-related intangibles.