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Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 291.9		$ 289.4
Less accumulated depreciation	(118.5)		(114.1)
Total	173.4		175.3
Depreciation expense	5.5	$ 5.8
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1.1		1.1
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	46.7		46.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	219.6		218.2
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24.5		$ 23.3

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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