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
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 530.6	$ 492.7
Component products
Disaggregation Of Revenue [Line Items]
Net sales	38.0	41.2
Component products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	29.9	27.4
Component products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	8.1	13.8
Real estate management and development
Disaggregation Of Revenue [Line Items]
Net sales	$ 13.8	$ 25.2