Supplemental Balance Sheet Data and Cash Flow Information - Schedule of Property. Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	$ 192.6	$ 173.6
Accumulated depreciation	(67.8)	(49.2)
Property, plant, and equipment, net	124.8	124.4
Land
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	4.2	4.2
Buildings and Improvements
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	8.7	8.7
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	18.0	15.3
Computer and office equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	10.4	10.7
Converting Machines
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment	$ 151.3	$ 134.7