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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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