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Information on Business Segments - Net Sales and Operating Income by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 1,402.7 $ 1,327.9
Operating income $ 155.0 135.6
Net Sales, Percentage Change vs. Prior Year 5.60%  
Operating Income, Percentage Change vs. Prior Year 14.30%  
Corporate [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income $ (24.7) (19.2)
Operating Income, Percentage Change vs. Prior Year (28.60%)  
Cabinets [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 620.0 573.0
Operating income $ 43.7 43.2
Net Sales, Percentage Change vs. Prior Year 8.20%  
Operating Income, Percentage Change vs. Prior Year 1.20%  
Plumbing [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 469.0 458.6
Operating income $ 104.5 89.2
Net Sales, Percentage Change vs. Prior Year 2.30%  
Operating Income, Percentage Change vs. Prior Year 17.20%  
Doors & Security [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 313.7 296.3
Operating income $ 31.5 $ 22.4
Net Sales, Percentage Change vs. Prior Year 5.90%  
Operating Income, Percentage Change vs. Prior Year 40.60%