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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 2,080.3
Translation adjustments 0.3
Acquisition-related adjustments 4.3
Ending Balance 2,084.9
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 924.0
Translation adjustments 1.1
Ending Balance 925.1
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 743.7
Translation adjustments (1.2)
Ending Balance 742.5
Doors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 412.6
Translation adjustments 0.4
Acquisition-related adjustments 4.3
Ending Balance $ 417.3