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3. Fair Value Measurements Contingent Consideration (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Apr. 10, 2014
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Additional performance period 4 months          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ (1.4)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ (5.8)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ (16.1)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1      
CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability 17.7us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
    44.6us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
   
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 2.4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
         
Net decrease in estimated fair value of contingent consideration included in selling, general and administrative expense (0.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
         
GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability 10.0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
      10.7us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
 
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         70.0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
 
Net decrease in estimated fair value of contingent consideration included in selling, general and administrative expense (0.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
         
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances $ 10.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_BusinessAcquisitionAxis
= bio_GnuBIOMember
         
Credit Adjusted Discount Rates Lower [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .0062          
Sales milestone percentage of annual invoices [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Acquisition, Contingent Consideration, Potential Percentage Payout 40.00%bio_BusinessAcquisitionContingentConsiderationPotentialPercentagePayout
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
/ us-gaap_ContingentConsiderationByTypeAxis
= bio_SalesmilestonepercentageofannualinvoicesMember
         
Projected Volatility of Growth Rates Lower [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .1          
Market Price of Risk [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .0175          
Probability Lower [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs 0.5          
Probability Higher [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .75          
Discount Rate Lower [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .0034          
Discount Rate Higher [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .0048          
probability lower1 [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs 0          
Discount Rate Lower 1 [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs .0092          
Discount Rate Higher 1 [Member] | GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs 0.0204          
Scenario, Forecast [Member] | Sales milestone percentage of annual invoices [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Acquisition, Contingent Consideration, Potential Percentage Payout           39.00%bio_BusinessAcquisitionContingentConsiderationPotentialPercentagePayout
/ us-gaap_BusinessAcquisitionAxis
= bio_CellsorterMember
/ us-gaap_ContingentConsiderationByTypeAxis
= bio_SalesmilestonepercentageofannualinvoicesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember