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Information on Business Segments - Net Sales and Operating Income by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 1,327.9 $ 1,254.6
Operating income $ 135.6 119.4
Net Sales, Percentage Change vs. Prior Year 5.80%  
Operating Income, Percentage Change vs. Prior Year 13.60%  
Corporate [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Operating income $ (19.2) (21.3)
Operating Income, Percentage Change vs. Prior Year 9.90%  
Cabinets [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 573.0 557.2
Operating income $ 43.2 24.1
Net Sales, Percentage Change vs. Prior Year 2.80%  
Operating Income, Percentage Change vs. Prior Year 79.30%  
Plumbing [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 458.6 449.7
Operating income $ 89.2 88.4
Net Sales, Percentage Change vs. Prior Year 2.00%  
Operating Income, Percentage Change vs. Prior Year 0.90%  
Doors & Security [Member] | Operating Segments [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 296.3 247.7
Operating income $ 22.4 $ 28.2
Net Sales, Percentage Change vs. Prior Year 19.60%  
Operating Income, Percentage Change vs. Prior Year (20.60%)