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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for cash discounts, returns and sales allowances      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 84.0 $ 68.2 $ 50.3
Charged to Expense 216.1 205.7 148.6
Reclassifications [1] (16.0) 3.0  
Write-offs, and Deductions [2] 199.5 192.9 130.7
Balance at End of Period 84.6 84.0 68.2
Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 3.3 7.4 5.8
Charged to Expense 1.5 0.2 4.3
Write-offs, and Deductions [2] 1.4 4.5 2.7
Business Acquisition [3] 0.3 0.2  
Balance at End of Period 3.7 3.3 7.4
Allowance for deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 11.0 16.4 19.7
Charged to Expense 2.3 (5.4) (3.3)
Balance at End of Period $ 13.3 $ 11.0 $ 16.4
[1] Represents reclassification of reserve for returns to a separate liability account due to our adoption of the revenue recognition standard and a reclassification of sales allowances to certain customer program liabilities across all segments during 2018. 2017 represents a reclassification of certain customer program liabilities to sales allowances (reduction to accounts receivable) in the Doors & Security segment.
[2] Net of recoveries of amounts written off in prior years and immaterial foreign currency impact.
[3] Represents purchase accounting adjustment related to the Fiberon acquisition within our Doors and Security segment in 2018. 2017 represents a valuation allowance on an acquired net operating loss carryforward (Norcraft Canada).