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Information on Business Segments - Net Sales and Operating Income by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 1,771.0 $ 1,402.7
Operating income $ 248.4 155.0
Net Sales, Percentage Change vs. Prior Year 26.30%  
Operating Income, Percentage Change vs. Prior Year 60.30%  
Corporate [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income $ (24.9) (24.7)
Operating Income, Percentage Change vs. Prior Year (0.80%)  
Plumbing [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 621.6 469.0
Operating income $ 147.9 104.5
Net Sales, Percentage Change vs. Prior Year 32.50%  
Operating Income, Percentage Change vs. Prior Year 41.50%  
Outdoors & Security [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 461.5 313.7
Operating income $ 52.8 31.5
Net Sales, Percentage Change vs. Prior Year 47.10%  
Operating Income, Percentage Change vs. Prior Year 67.60%  
Cabinets [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 687.9 620.0
Operating income $ 72.6 $ 43.7
Net Sales, Percentage Change vs. Prior Year 11.00%  
Operating Income, Percentage Change vs. Prior Year 66.10%