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2. Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jan. 18, 2012
Portland [Member]
Jun. 30, 2012
QuantaLife [Member]
Oct. 04, 2011
QuantaLife [Member]
Business Acquisition [Line Items]        
Business Acquisition, Cost of Acquired Entity, Purchase Price   $ 12.5   $ 179.4
Business Acquisition, Purchase Price Allocation, Net Tangible Assets   6.3   (20.8)
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets   5.1   94.7
Business Acquisition, Purchase Price Allocation, Goodwill Amount   1.1   105.5
Employment agreement   2.0    
Business Acquisition, Cost of Acquired Entity, Cash Paid       150.3
Purchase Price Holdback Consideration       5.0
Business Acquisition, Contingent Consideration, at Fair Value       24.1
Business Acquisition, Contingent Consideration, Potential Cash Payment     45 48
Goodwill, Purchase Accounting Adjustments $ (0.6)   $ (0.6)