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Business Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($)
$ in Millions
May 31, 2016
Feb. 27, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition [Line Items]          
Goodwill     $ 195.3 $ 177.2 $ 169.2
German Clinic [Member]          
Business Acquisition [Line Items]          
Current assets   $ 3.1      
Real property   20.7      
Equipment   1.6      
Goodwill   8.7      
Current liabilities   (4.4)      
Long-term liabilities   (9.6)      
Total fair value purchase price   20.1      
Total cash consideration transferred   $ 20.1      
Sividon Diagnostics GmbH          
Business Acquisition [Line Items]          
Current assets $ 2.7        
Intangible assets 46.2        
Equipment 0.3        
Goodwill 17.7        
Current liabilities (15.4)        
Total fair value purchase price 51.5        
Less: Contingent consideration (10.5)        
Less: Cash acquired (2.0)        
Total cash consideration transferred $ 39.0