Segment Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 266.9	$ 287.4
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	108.2	114.0
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	36.1	41.6
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 122.6	$ 131.8