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3. Fair Value Measurements 3. Contingent Consideration (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Apr. 01, 2020
Dec. 31, 2019
Oct. 01, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 2.7   $ 2.7   $ 4.9  
Business Combination, Contingent Consideration, Liability       $ 0.1   $ 0.6
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       60.0    
Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent consideration milestone payments (1.3)   (1.3)      
Business Combination, Contingent Consideration, Liability 2.0   2.0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances     (1.0)      
Distributor [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent consideration milestone payments (1.4) $ (0.7)        
Business Combination, Contingent Consideration, Liability 0.6   0.6      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances 0.0          
Celsee            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability 0.1   0.1 0.1    
Business Combination, Contingent Consideration, Liability, Noncurrent       $ 0.1    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 60.0   $ 60.0      
Sales milestone percentage of annual invoices [Member] | Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Acquisition, Contingent Consideration, Potential Percentage Payout 39.00%   39.00%      
Sales milestone percentage of annual invoices low [Member] | Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Acquisition, Contingent Consideration, Potential Percentage Payout 20.00%   20.00%      
Sales milestone minimum amount [Member] | Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 0.0   $ 0.0      
Fair Value, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1] 2.7   2.7   4.9  
Other Noncurrent Liabilities [Member] | Fair Value, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1] 0.1   0.1   1.6  
Other Current Liabilities [Member] | Fair Value, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1] $ 2.6   $ 2.6   $ 3.3  
[1] Contingent consideration liability is included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2020December 31, 2019
Other current liabilities$2.6  $3.3  
Other long-term liabilities0.1  1.6  
   Total$2.7  $4.9