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Business Acquisitions - Allocation of Consideration Transferred for Crescendo (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2014
Feb. 28, 2014
Jun. 30, 2013
Business Acquisition [Line Items]        
Goodwill $ 177.2 $ 169.2   $ 56.9
Crescendo Biosciences, Inc.        
Business Acquisition [Line Items]        
Other assets acquired     $ 15.9  
Intangible assets     196.6  
Goodwill     112.3  
Total assets acquired     324.8  
Deferred tax liabilities     44.2  
Other liabilities assumed     21.6  
Total net assets acquired     $ 259.0