Discontinued Operations - Summary of Financial Results of Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes	$ (18.0)	$ (195.8)	$ (32.0)
Less: Net loss attributable to non-controlling interest	(3.1)	(8.3)	(7.2)
Net loss from discontinued operations	(14.9)	(187.5)	(24.8)
Spin-off | Veoneer, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	547.9	1,122.9	1,675.3
Cost of sales	(438.5)	(898.4)	(1,331.9)
Gross profit	109.4	224.5	343.4
Selling, general and administrative expenses	(22.3)	(59.7)	(67.1)
Research, development and engineering expenses, net	(89.4)	(224.0)	(275.7)
Amortization of intangibles	(6.1)	(10.5)	(29.7)
Other income (expense), net	(0.1)	(53.4)	12.5
Operating loss	(8.5)	(123.1)	(16.6)
Loss from equity method investments	(9.9)	(29.9)	(17.7)
Interest income		0.7
Interest expense		(0.4)	(0.1)
Other non-operating items, net	0.2	0.5	(0.1)
Loss before income taxes	(18.2)	(152.2)	(34.5)
Income tax (expense) benefit	0.2	(43.6)	2.5
Loss from discontinued operations, net of income taxes	(18.0)	(195.8)	(32.0)
Less: Net loss attributable to non-controlling interest	(3.1)	(8.3)	(7.2)
Net loss from discontinued operations	$ (14.9)	$ (187.5)	$ (24.8)