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2. Acquisitions (Details)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Jun. 30, 2013
AbD Serotec [Member]
USD ($)
Mar. 31, 2013
AbD Serotec [Member]
USD ($)
Jan. 10, 2013
AbD Serotec [Member]
USD ($)
Aug. 31, 2012
CellSorter [Member]
USD ($)
Jul. 30, 2012
Benelux [Member]
USD ($)
Jul. 30, 2012
Benelux [Member]
EUR (€)
Jan. 18, 2012
Portland [Member]
USD ($)
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
CellSorter [Member]
USD ($)
Business Acquisition [Line Items]                
Business Acquisition, Cost of Acquired Entity, Purchase Price     $ 62.2 $ 49.6 $ 5.6 € 4.6 $ 12.5  
Cash Acquired from Acquisition   7.3            
Finite-Lived Intangible Assets, Purchase Accounting Adjustments 1.7              
Goodwill, Purchase Accounting Adjustments (2.1)              
bio_NetAssetPurchaseAccountingAdjustment 0.4              
Business Acquisition, Purchase Price Allocation, Net Tangible Assets     3.3 0.1 (2.3)   6.3  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets     44.0 32.1 4.9   5.1  
Business Acquisition, Purchase Price Allocation, Goodwill Amount     14.9 17.4 3.0   1.1  
Employment agreement             2.0  
Business Acquisition, Cost of Acquired Entity, Cash Paid       5.0        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability               44.6
Business Acquisition, Contingent Consideration, at Fair Value, Current       19.9        
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent       $ 24.7