Segments, Concentrations and Geographic Information - Net Sales to Third Parties by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 472.1	$ 434.2
North America (primarily U.S.) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	247.0	245.3
Europe Excluding Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	84.9	74.8
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	51.0	52.5
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	64.1	38.4
Asia and Other Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 25.1	$ 23.2