Property, Plant and Equipment - Components of Company's Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 148.0	$ 152.5
Less: Accumulated depreciation	(123.0)	(120.3)
Total	25.0	32.2
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	2.8	10.0
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	33.1	36.2
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 112.1	$ 106.3