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Other Financial Statement Information - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jun. 01, 2018	Nov. 02, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Cost of inventories for certain materials using LIFO method			$ 32.0	$ 29.5
Depreciation of property and equipment			12.3	12.1	$ 11.8
Financing leases of machinery, equipment and aircraft			$ 0.2	$ 0.1
Name of plaintiff			Altalink, L.P.
Complaint filling date			November 2016
Estimated damages from defendants	$ 29.4	$ 56.0

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of lessee's right to use underlying asset under finance lease.

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The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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