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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
[1]
Goodwill And Intangible Assets [Line Items]    
Goodwill $ 413.2 $ 318.6
Diagnostics [Member]    
Goodwill And Intangible Assets [Line Items]    
Goodwill 347.5  
Other [Member]    
Goodwill And Intangible Assets [Line Items]    
Goodwill $ 65.7  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.