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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 533.6	$ 468.9	$ 1,623.9	$ 1,468.7
Component products
Disaggregation Of Revenue [Line Items]
Net sales	33.6	40.3	107.5	118.1
Component products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	26.6	31.4	84.7	84.4
Component products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	7.0	8.9	22.8	33.7
Real estate management and development
Disaggregation Of Revenue [Line Items]
Net sales	$ 15.3	$ 31.7	$ 52.4	$ 84.2

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