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3. Fair Value Measurements Contingent Consideration (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 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]
Jan. 31, 2013
QuantaLife [Member]
Dec. 31, 2012
QuantaLife [Member]
Oct. 04, 2011
QuantaLife [Member]
Dec. 31, 2012
QuantaLife [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
CellSorter [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Aug. 31, 2012
CellSorter [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Aug. 31, 2012
Development [Member]
CellSorter [Member]
Dec. 31, 2012
Development [Member]
CellSorter [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Aug. 31, 2012
Sales [Member]
CellSorter [Member]
Dec. 31, 2012
Sales [Member]
CellSorter [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Credit Adjusted Discount Rates Lower [Member]
QuantaLife [Member]
Dec. 31, 2012
Credit Adjusted Discount Rates Lower [Member]
CellSorter [Member]
Dec. 31, 2012
Development milestone maximum payment [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone minimum payment [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone year 1 maximum payment percentage [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone year 2 maximum payment percentage [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone year 3 maximum payment percentage [Member]
CellSorter [Member]
Dec. 31, 2012
Sales Milestone year 1 purchase orders [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone year 2 purchase orders [Member]
CellSorter [Member]
Dec. 31, 2012
Sales milestone year 3 purchase orders [Member]
CellSorter [Member]
Dec. 31, 2012
Credit Adjusted Discount Rate Higher [Member]
QuantaLife [Member]
Dec. 31, 2012
Credit Adjusted Discount Rate Higher [Member]
CellSorter [Member]
Dec. 31, 2012
Projected Volatility of Growth Rates Lower [Member]
QuantaLife [Member]
Dec. 31, 2012
Projected Volatility of Growth Rates Higher [Member]
QuantaLife [Member]
Dec. 31, 2012
Market Price of Risk [Member]
QuantaLife [Member]
Dec. 31, 2012
Market Price of Risk [Member]
CellSorter [Member]
Dec. 31, 2012
Projected Volatility of Sales [Member] [Member]
CellSorter [Member]
Dec. 31, 2012
Probablity [Member]
CellSorter [Member]
Dec. 31, 2012
Probability Higher [Member]
CellSorter [Member]
Dec. 31, 2012
Risk-Adjusted Discount Rate [Member]
CellSorter [Member]
Dec. 31, 2012
Risk adjusted discount rate higher [Member]
CellSorter [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                  
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs                         .0064 .01                 .0103 .017 .124 .300 .004 .014 .18 .99 1 .008 .01
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements     $ 6,000,000                                                            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           (16,100,000) 44,600,000                                                    
Business Acquisition, Contingent Consideration, at Fair Value 52,600,000 [1] 24,100,000 [1]     24,100,000 8,000,000 44,600,000 44,600,000                                                  
Business Acquisition, Contingent Consideration, Potential Cash Payment       37,000,000 48,000,000                   20,000,000 0       20,000,000 30,000,000 45,000,000                      
Business Acquisition, Contingent Consideration, Potential Percentage Payout                                 60.00% 56.70% 54.40%                            
Business Acquisition, Contingent Consideration, at Fair Value, Current                 19,900,000 19,900,000                                              
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent                     $ 24,700,000 $ 24,700,000                                          
[1] Contingent consideration liability is included in the following accounts in the Consolidated Balance Sheet (in millions): December 31, 2012 December 31, 2011 Other current liabilities$27.3 $8.5Other long-term liabilities25.3 15.6 Total$52.6 $24.1