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Summary of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 05, 2017
Dec. 31, 2016
Aug. 08, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Goodwill $ 516.7   $ 491.5   $ 420.9
Aquasana          
Business Acquisition [Line Items]          
Current assets, net of cash acquired       $ 7.3  
Property, plant and equipment       2.7  
Intangible assets       30.0  
Goodwill       60.4  
Total assets acquired       100.4  
Current liabilities       (7.1)  
Long-term liabilities       (8.2)  
Total liabilities assumed       (15.3)  
Net assets acquired       $ 85.1  
Hague          
Business Acquisition [Line Items]          
Current assets, net of cash acquired   $ 7.8      
Property, plant and equipment   6.9      
Intangible assets   12.8      
Goodwill   22.2      
Total assets acquired   49.7      
Current liabilities   (5.6)      
Long-term liabilities   (1.0)      
Total liabilities assumed   (6.6)      
Net assets acquired   $ 43.1