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Revenue - Disaggregation of Sales - Schedule of Disaggregates of Net Sales of our Component Products and Real Estate Management and Development Segments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 525.3	$ 415.0	$ 1,034.3	$ 874.3
Component Products
Disaggregation Of Revenue [Line Items]
Net sales	36.3	23.8	72.2	56.1
Component Products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	27.6	18.6	53.5	44.0
Component Products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	8.7	5.2	18.7	12.1
Real Estate Management And Development
Disaggregation Of Revenue [Line Items]
Net sales	10.4	5.2	18.5	11.2
Real Estate Management And Development | Land Sales
Disaggregation Of Revenue [Line Items]
Net sales	8.5	2.7	15.1	6.2
Real Estate Management And Development | Water Delivery
Disaggregation Of Revenue [Line Items]
Net sales	1.5	2.1	2.5	4.0
Real Estate Management And Development | Utility and Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 0.4	$ 0.4	$ 0.9	$ 1.0

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