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3. Fair Value Measurements 3. Contingent Consideration (Details) (USD $)
1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jan. 31, 2013
QuantaLife [Member]
Oct. 04, 2011
QuantaLife [Member]
Sep. 30, 2013
CellSorter [Member]
Aug. 31, 2012
Development [Member]
CellSorter [Member]
Aug. 31, 2012
Sales [Member]
CellSorter [Member]
Sep. 30, 2013
Development milestone maximum payment [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone minimum payment [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone year 1 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone year 2 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone year 3 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2013
Credit Adjusted Discount Rates Lower [Member]
CellSorter [Member]
Sep. 30, 2013
Credit Adjusted Discount Rate Higher [Member]
CellSorter [Member]
Sep. 30, 2013
Market Price of Risk [Member]
CellSorter [Member]
Sep. 30, 2013
Projected Volatility of Sales [Member]
CellSorter [Member]
Sep. 30, 2013
Sales Milestone year 1 bookings [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone year 2 bookings [Member]
CellSorter [Member]
Sep. 30, 2013
Sales milestone year 3 bookings [Member]
CellSorter [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
QuantaLife [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
CellSorter [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
CellSorter [Member]
Aug. 31, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
CellSorter [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                      
Business Acquisition, Contingent Consideration, at Fair Value   $ 24,100,000   $ 19,900,000 $ 24,700,000                                   $ 44,600,000        
Contingent consideration milestone payments (6,000,000)   (20,000,000)                                                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low             0                                        
(Decrease) increase in fair value of contingent consideration included in SGA                                       (2,000,000) 600,000            
Contingent Consideration at Fair Value                                   25,200,000 [1] 52,600,000 [1]   25,200,000 44,600,000   0 [1] 0 [1] 0 [1] 0 [1]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 48,000,000       $ 20,000,000                 $ 20,000,000 $ 30,000,000 $ 45,000,000                    
Business Acquisition, Contingent Consideration, Potential Percentage Payout               60.00% 51.32% 50.38%                                  
Contingent Consideration Level 3 Inputs                     0.0109 0.0204 0.013 0.15                          
[1] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2013 December 31, 2012Other current liabilities$6.9 $27.3Other long-term liabilities18.3 25.3 Total$25.2 $52.6