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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, 2023
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 1,640.7 [1]
Year-to-date translation adjustments 0.6
Acquisition-related adjustments 262.9
Ending Balance 1,904.2 [1]
Water [Member]  
Goodwill [Line Items]  
Beginning Balance 893.4 [1]
Year-to-date translation adjustments 0.5
Acquisition-related adjustments 243.3
Ending Balance 1,137.2 [1]
Outdoors [Member]  
Goodwill [Line Items]  
Beginning Balance 651.0 [1]
Year-to-date translation adjustments 0.0
Acquisition-related adjustments 0.1
Ending Balance 651.1 [1]
Security [Member]  
Goodwill [Line Items]  
Beginning Balance 96.3 [1]
Year-to-date translation adjustments 0.1
Acquisition-related adjustments 19.5
Ending Balance $ 115.9 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors segment.