Supplemental Balance Sheet Information - Schedule of Additional Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 10.5	$ 12.7
Less accumulated depreciation	(9.7)	(9.9)
Property, plant and equipment, net	0.8	2.8
Buildings and Leasehold Improvements
Property, Plant and Equipment
Property, plant, and equipment, gross	0.5	3.3
Machinery and Equipment
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 10.0	$ 9.4