Revenue from Continuing Operations Disaggregated by Primary Region and Products (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Net sales		$ 2,174.0	$ 2,240.9
China
Disaggregation Of Revenue [Line Items]
Net sales		330.4	366.4
Japan
Disaggregation Of Revenue [Line Items]
Net sales		208.1	214.7
Rest of Asia
Disaggregation Of Revenue [Line Items]
Net sales		212.2	211.1
Americas
Disaggregation Of Revenue [Line Items]
Net sales		743.1	667.2
Europe
Disaggregation Of Revenue [Line Items]
Net sales		680.2	781.5
Airbag Products and Other
Disaggregation Of Revenue [Line Items]
Net sales	[1]	1,447.7	1,439.6
Seatbelt Products
Disaggregation Of Revenue [Line Items]
Net sales	[1]	$ 726.3	$ 801.3

[1] Including Corporate and other sales.