Disaggregation of sales - Schedule of Disaggregates of Net Sales of our Component Products and Real Estate Management and Development Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue - disaggregation of sales
Net sales	$ 2,077.0	$ 2,104.8	$ 1,921.7
Component Products [Member]
Revenue - disaggregation of sales
Net sales	158.3	145.9	161.3
Real Estate Management And Development [Member]
Revenue - disaggregation of sales
Net sales	59.3	71.8	93.9
Real Estate Management And Development [Member] | Land Sales [Member]
Revenue - disaggregation of sales
Net sales	59.3	71.5	92.6
Real Estate Management And Development [Member] | Utility And Other [Member]
Revenue - disaggregation of sales
Net sales		0.3	1.3
Security Products [Member] | Component Products [Member]
Revenue - disaggregation of sales
Net sales	120.7	115.2	121.2
Marine Components [Member] | Component Products [Member]
Revenue - disaggregation of sales
Net sales	$ 37.6	$ 30.7	$ 40.1