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3. Fair Value Measurements Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 25 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value       $ 16.7    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (6.2) (18.1) $ (0.4)  
Fair Value, Measurements, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1]     8.4 $ 16.7   $ 8.4
Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value     8.4     8.4
Business Combination, Contingent Consideration, Liability     8.4     8.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements $ (0.8) $ (1.3) (2.1)      
Net (decrease) increase in estimated fair value of contingent consideration included in selling, general and administrative expense     $ (6.2)     $ 12.2
Discount rate [Member] | Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Discount Rate     11.00%      
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
Cost of debt [Member] | Analytical Flow Cytometer Platform [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Discount Rate     5.10%      
[1] Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions):
 
December 31, 2018
 
December 31, 2017
 
 
 
 
Other current liabilities
$
3.2

 
$
2.7

Other long-term liabilities
5.2

 
14.0

   Total
$
8.4

 
$
16.7