Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment
Property, plant and equipment, at cost	$ 537.4	$ 525.8
Accumulated depreciation	(335.5)	(327.3)
Property, plant and equipment, net	201.9	198.5	$ 189.7
Land
Property, plant and equipment
Property, plant and equipment, at cost	14.1	14.5
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	165.7	164.6
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	342.2	336.9
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 15.4	$ 9.8