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Business Combinations - Summary of Preliminary Purchase Price Allocation of Major Class of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Sep. 29, 2018
Jun. 30, 2018
Business Acquisition [Line Items]    
Goodwill $ 746.6 $ 740.5
2019 Acquisitions [Member]    
Business Acquisition [Line Items]    
Net working capital 10.6  
Goodwill 6.3  
Other intangible assets 13.5  
Property, plant and equipment 1.1  
Total purchase price $ 31.5