Goodwill (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill

	Passive Safety Segment		Electronics Segment			Total
Carrying amount December 31, 2017	$	1,397.1	$	291.7		$	1,688.8
Effect of currency translation		2.9		(0.2	)		2.7
Carrying amount March 31, 2018	$	1,400.0	$	291.5		$	1,691.5