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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, 2020
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 2,090.2 [1]
Translation adjustments (5.0)
Ending Balance 2,085.2 [1]
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 747.3 [1]
Translation adjustments (3.9)
Ending Balance 743.4 [1]
Doors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 417.4 [1]
Translation adjustments (0.3)
Ending Balance 417.1 [1]
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 925.5 [1]
Translation adjustments (0.8)
Ending Balance $ 924.7 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.