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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 507.1	$ 634.6	$ 999.8	$ 1,263.6
Component Products
Disaggregation Of Revenue [Line Items]
Net sales	36.6	41.6	77.8	83.7
Component Products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	25.6	28.8	53.0	58.4
Component Products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	11.0	12.8	24.8	25.3
Real Estate Management And Development
Disaggregation Of Revenue [Line Items]
Net sales	27.3	27.7	52.5	51.7
Real Estate Management And Development | Land Sales
Disaggregation Of Revenue [Line Items]
Net sales	27.0	25.9	51.9	48.1
Real Estate Management And Development | Water Delivery
Disaggregation Of Revenue [Line Items]
Net sales		1.4		2.9
Real Estate Management And Development | Utility and Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 0.3	$ 0.4	$ 0.6	$ 0.7