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2. Fair Value Measurements 2. Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 19 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 13.0 $ 13.0 $ 13.0 $ 16.7
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 $ 13.0 13.0 13.0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances   $ (2.4) $ (8.5)  
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% 39.00%  
Market Price of Risk [Member] | Analytical Flow Cytometer Platform [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount Rate   11.10%    
Projected Volatility of Growth Rate [Member] | Analytical Flow Cytometer Platform [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount Rate   4.80%    
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% 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 $ 0.0  
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability [1] 13.0 13.0 13.0 16.7
Other Noncurrent Liabilities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 10.4 10.4 10.4 14.0
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability $ 2.6 $ 2.6 $ 2.6 $ 2.7
[1] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):

 
June 30, 2018
 
December 31, 2017
Other current liabilities
$
2.6

 
$
2.7

Other long-term liabilities
10.4

 
14.0

   Total
$
13.0

 
$
16.7