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3. Fair Value Measurements 3. Contingent Consideration (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended
Sep. 30, 2012
QuantaLife [Member]
Oct. 04, 2011
QuantaLife [Member]
Aug. 31, 2012
CellSorter [Member]
Sep. 30, 2012
Development milestone maximum payment [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone minimum payment [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone year 1 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone year 2 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone year 3 maximum payment percentage [Member]
CellSorter [Member]
Sep. 30, 2012
Credit Adjusted Discount Rates Lower [Member]
QuantaLife [Member]
Sep. 30, 2012
Credit Adjusted Discount Rates Lower [Member]
CellSorter [Member]
Sep. 30, 2012
Credit Adjusted Discount Rate Higher [Member]
QuantaLife [Member]
Sep. 30, 2012
Credit Adjusted Discount Rate Higher [Member]
CellSorter [Member]
Sep. 30, 2012
Projected Volatility of Growth Rates Lower [Member]
QuantaLife [Member]
Sep. 30, 2012
Projected Volatility of Growth Rates Higher [Member]
QuantaLife [Member]
Sep. 30, 2012
Market Price of Risk [Member]
QuantaLife [Member]
Sep. 30, 2012
Market Price of Risk [Member]
CellSorter [Member]
Sep. 30, 2012
Probablity [Member]
QuantaLife [Member]
Sep. 30, 2012
Probablity [Member]
CellSorter [Member]
Sep. 30, 2012
Risk-Adjusted Discount Rate [Member]
QuantaLife [Member]
Sep. 30, 2012
Risk-Adjusted Discount Rate [Member]
CellSorter [Member]
Sep. 30, 2012
Projected Volatility of Sales [Member]
CellSorter [Member]
Sep. 30, 2012
Probability Higher [Member]
CellSorter [Member]
Sep. 30, 2012
Risk adjusted discount rate higher [Member]
CellSorter [Member]
Sep. 30, 2012
Sales Milestone year 1 bookings [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone year 2 bookings [Member]
CellSorter [Member]
Sep. 30, 2012
Sales milestone year 3 bookings [Member]
CellSorter [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
QuantaLife [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
CellSorter [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                            
Business Acquisition, Contingent Consideration, at Fair Value, Current     $ 19.9                                                      
Business Acquisition, Contingent Consideration, Potential Cash Payment 42 48   20 0                                     20 30 45        
Business Acquisition, Contingent Consideration, Potential Percentage Payout           60.00% 56.70% 54.40%                                            
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs                 .0064 .01 .0103 .017 .124 .300 .004 .014 .95 .99 .0064 .008 .18 1 .01              
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent     24.7                                                      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                            
Business Acquisition, Contingent Consideration, at Fair Value beginning of period   24.1                                                 52.7 [1] 24.1 [1]    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability                                                         16.0 (44.6)
Business Acquisition, Contingent Consideration, at Fair Value end of period   $ 24.1                                                 $ 52.7 [1] $ 24.1 [1] $ 8.1  
[1] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheet (in millions): September 30, 2012 December 31, 2011Other current liabilities$26.7 $8.5Other long-term liabilities26.0 15.6 Total$52.7 $24.1