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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for cash discounts, returns and sales allowances      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line items]      
Balance at Beginning of Period $ 84.6 $ 84.0 $ 68.2
Charged to Expense 198.6 216.1 205.7
Reclassifications [1]   (16.0) 3.0
Write-offs, and Deductions [2] 186.3 199.5 192.9
Balance at End of Period 96.9 84.6 84.0
Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line items]      
Balance at Beginning of Period 3.7 3.3 7.4
Charged to Expense 1.6 1.5 0.2
Write-offs, and Deductions [2] 2.3 1.4 4.5
Business Acquisition [3]   0.3 0.2
Balance at End of Period 3.0 3.7 3.3
Allowance for deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line items]      
Balance at Beginning of Period 13.3 11.0 16.4
Charged to Expense 3.5 2.3 (5.4)
Balance at End of Period $ 16.8 $ 13.3 $ 11.0
[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).