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3. Fair Value Measurements 3. Contingent Consideration (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Apr. 10, 2014
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 24.8   $ 27.7 $ 24.8    
CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent consideration milestone payments   $ (3.0) (2.4) (3.0)    
(Decrease) increase in fair value of contingent consideration included in SGA 0.3     0.1    
Business Combination, Contingent Consideration, Liability 14.8     14.8   $ 44.6
GnuBIO [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
(Decrease) increase in fair value of contingent consideration included in SGA       0.0    
Business Combination, Contingent Consideration, Liability 10.0     $ 10.0 $ 10.7  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         $ 70.0  
Credit Adjusted Discount Rates Lower [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Level 3 Inputs       .0064    
Credit Adjusted Discount Rate Higher [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Level 3 Inputs       .0091    
Market Price of Risk [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Level 3 Inputs       .0125    
Projected Volatility of Growth Rate [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Level 3 Inputs       .07    
Projected Volatility of Growth Rate Higher [Member] | CellSorter [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Level 3 Inputs       .1    
Fair Value, Measurements, Recurring [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination, Contingent Consideration, Liability [1] 24.8   27.7 $ 24.8    
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 8.1   14.6 8.1    
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 $ 16.7   $ 13.1 $ 16.7    
[1] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): June 30, 2015 December 31, 2014Other current liabilities$16.7 $13.1Other long-term liabilities8.1 14.6 Total$24.8 $27.7