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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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 divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Supplemental Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 294.1			$ 294.1		$ 289.4
Less accumulated depreciation	(124.4)			(124.4)		(114.1)
Total	169.7			169.7		175.3
Write-off of machinery and equipment		$ 5.0
Depreciation expense	5.4		$ 5.8	16.3	$ 17.5
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1.1			1.1		1.1
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47.3			47.3		46.8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	216.4			216.4		218.2
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 29.3			$ 29.3		$ 23.3