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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Beginning Balance [1] $ 1,538.9 $ 1,468.7
Translation adjustments (10.2) (1.2)
Acquisition-related adjustments 112.0 71.4
Ending Balance [1] 1,640.7 1,538.9
Water Innovations [Member]    
Goodwill [Line Items]    
Beginning Balance [1] 814.1 750.1
Translation adjustments (9.4) (1.3)
Acquisition-related adjustments 88.7 65.3
Ending Balance [1] 893.4 814.1
Outdoors & Security [Member]    
Goodwill [Line Items]    
Beginning Balance [1] 724.8 718.6
Translation adjustments (0.8) 0.1
Acquisition-related adjustments 23.3 6.1
Ending Balance [1] $ 747.3 $ 724.8
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.