Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment
Property, plant and equipment, at cost	$ 608.6	$ 557.9
Accumulated depreciation	(396.3)	(357.9)
Property, plant and equipment, net	212.3	200.0	$ 201.9
Land
Property, plant and equipment
Property, plant and equipment, at cost	13.2	13.9
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	194.3	175.8
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	386.6	354.7
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 14.5	$ 13.5