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Acquisitions and Divestitures - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Sep. 28, 2013
Mar. 30, 2013
Dec. 31, 2013
Business Acquisition [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       19.90%
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 134.7      
Noncontrolling Interest, Ownership Percentage by Parent       80.10%
Cash sales price of business 30.0      
Gain on sale of business (8.0) 0.1 16.7  
Goodwill written off from sale     5.3  
Pentair Residential Filtration [Member]
       
Business Acquisition [Line Items]        
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 134.3