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Acquisitions - Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Apr. 02, 2016
Jan. 04, 2016
Jan. 02, 2016
Business Acquisition [Line Items]      
Goodwill $ 779.8   $ 759.6
AquaTerra Corporation [Member]      
Business Acquisition [Line Items]      
Cash   $ 1.3  
Accounts receivable   6.2  
Inventories   2.1  
Prepaid expenses and other current assets   1.3  
Property, plant & equipment   13.4  
Goodwill   19.2  
Intangible and other assets   17.4  
Accounts payable and accrued liabilities   (15.8)  
Long-term debt   (0.3)  
Other long-term liabilities   (0.3)  
Total   $ 44.5