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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 528.6	$ 510.2	$ 1,008.2	$ 976.2
Component Products
Disaggregation Of Revenue [Line Items]
Net sales	33.7	32.4	64.9	60.8
Component Products | Security Products
Disaggregation Of Revenue [Line Items]
Net sales	26.9	27.2	51.6	51.3
Component Products | Marine Components
Disaggregation Of Revenue [Line Items]
Net sales	6.8	5.2	13.3	9.5
Real Estate Management And Development
Disaggregation Of Revenue [Line Items]
Net sales	10.4	6.0	22.3	13.2
Real Estate Management And Development | Land Sales
Disaggregation Of Revenue [Line Items]
Net sales	8.4	3.8	17.9	9.6
Real Estate Management And Development | Water Delivery
Disaggregation Of Revenue [Line Items]
Net sales	1.6	1.9	3.5	2.8
Real Estate Management And Development | Utility and Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 0.4	$ 0.3	$ 0.9	$ 0.8

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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