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3. Fair Value Measurements Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 01, 2020
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 $ 0.7 $ 0.7 $ 4.9      
Business Combination, Contingent Consideration, Liability         $ 0.1 $ 0.6
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         60.0  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   (1.0) (1.6) $ (6.2)    
Fair Value, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1] 0.7 0.7 $ 4.9      
Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   (3.3)        
Net (decrease) increase in estimated fair value of contingent consideration included in selling, general and administrative expense   (1.0)        
Distributor [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability 0.6 0.6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (0.7) (1.4)        
Net (decrease) increase in estimated fair value of contingent consideration included in selling, general and administrative expense   0.0        
Celsee [Member]            
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 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        
[1] Contingent consideration liabilities are included in the following accounts in the consolidated balance sheets (in millions):
December 31, 2020December 31, 2019
Other current liabilities$0.6 $3.3 
Other long-term liabilities0.1 1.6 
   Total$0.7 $4.9