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v3.20.4

Property, Plant and Equipment (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Continuing Operations [Member] |  |  |
Depreciation and amortization | $ 4.1 | $ 3.7 | $ 3.6

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