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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 578.9 | $ 458.6 | $ 1,613.2 | $ 1,332.9
Component Products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 34.5 | 28.4 | 106.7 | 84.5
Component Products | Security Products |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 25.8 | 21.2 | 79.3 | 65.2
Component Products | Marine Components |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 8.7 | 7.2 | 27.4 | 19.3
Real Estate Management And Development |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 44.6 | 13.3 | 63.1 | 24.5
Real Estate Management And Development | Land Sales |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 41.9 | 10.6 | 57.0 | 16.8
Real Estate Management And Development | Water Delivery |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 2.3 | 2.2 | 4.8 | 6.2
Real Estate Management And Development | Utility and Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 0.4 | $ 0.5 | $ 1.3 | $ 1.5

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