Segment Information - Reconciliation of Revenue from Segments to Consolidated (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	$ 1,176.9	$ 1,102.1
Primary Reporting Segment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	964.7	886.5
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	$ 212.2	$ 215.6