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3. Fair Value Measurements 3. Contingent Consideration (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Oct. 04, 2011
QuantaLife [Member]
Mar. 31, 2012
Credit Adjusted Discount Rates Lower [Member]
QuantaLife [Member]
Mar. 31, 2012
Credit Adjusted Discount Rate Higher [Member]
QuantaLife [Member]
Mar. 31, 2012
Projected Volatility of Growth Rates Lower [Member]
QuantaLife [Member]
Mar. 31, 2012
Projected Volatility of Growth Rates Higher [Member]
QuantaLife [Member]
Mar. 31, 2012
Market Price of Risk [Member]
QuantaLife [Member]
Mar. 31, 2012
Probablity [Member]
QuantaLife [Member]
Mar. 31, 2012
Risk-Adjusted Discount Rate [Member]
QuantaLife [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Business Acquisition, Contingent Consideration, Potential Cash Payment   $ 48              
Business Acquisition, Contingent Consideration, at Fair Value beginning of period 24.1 [1] 24.1              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 0.6                
Business Acquisition, Contingent Consideration, at Fair Value end of period $ 24.7 [1] $ 24.1              
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs     0.0082 .0138 .075 .15 .004 .95 .009
[1] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheet (in millions): March 31, 2012 December 31, 2011Other current liabilities$14.9 $8.5Other long-term liabilities9.8 15.6 Total$24.7 $24.1