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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
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 479.6 | $ 466.0
Component Products |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 31.2 | 28.4
Component Products | Security Products |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 24.7 | 24.1
Component Products | Marine Components |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 6.5 | 4.3
Real Estate Management And Development |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 11.9 | 7.2
Real Estate Management And Development | Land Sales |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 9.5 | 5.8
Real Estate Management And Development | Water Delivery |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 1.9 | 0.9
Real Estate Management And Development | Utility and Other |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 0.5 | $ 0.5

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