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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 468.9	$ 556.3	$ 1,468.7	$ 1,819.9
Component products
Disaggregation Of Revenue [Line Items]
Net sales	40.3	42.9	118.1	126.6
Component products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	31.4	28.5	84.4	86.9
Component products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	8.9	14.4	33.7	39.7
Real estate management and development
Disaggregation Of Revenue [Line Items]
Net sales	31.7	53.8	84.2	105.5
Real estate management and development | Land Sales
Disaggregation Of Revenue [Line Items]
Net sales	31.3	52.8	83.2	100.9
Real estate management and development | Water Delivery
Disaggregation Of Revenue [Line Items]
Net sales	0.0	0.7	0.0	3.6
Real estate management and development | Utility and Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 0.4	$ 0.3	$ 1.0	$ 1.0