Schedule of Goodwill (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Line Items]
Carrying amount at beginning of year	$ 1,666.3
Acquisition	221.4
Effect of currency translation	6.5
Carrying amount at end of year	1,894.2
Passive Safety
Goodwill [Line Items]
Carrying amount at beginning of year	1,388.3
Effect of currency translation	1.2
Carrying amount at end of year	1,389.5
Electronics
Goodwill [Line Items]
Carrying amount at beginning of year	278.0
Acquisition	221.4
Effect of currency translation	5.3
Carrying amount at end of year	$ 504.7