Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
		Jun. 29, 2018	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unrecognized losses in accumulated other comprehensive income	[1]		$ 55.0		$ 56.2	$ 80.1
Veoneer, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net decrease in unfunded status of sponsored pension and postretirement benefits other than pension		$ 22.8
Unrecognized losses in accumulated other comprehensive income		$ 6.3
Veoneer, Inc. | Amended and Restated Transition Services Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Services termination date			Mar. 31, 2020
Spin-off | Veoneer, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spin-off completion date		Jun. 29, 2018
Separation costs			$ 84.8
Cash		$ 1,000.0		$ 5.0
Net assets		2,129.0		$ 2,123.0
Accumulated other comprehensive loss		13.0
Non-controlling interest		112.0
Reduction to retained earnings		$ 2,030.0
Spin-off | Veoneer, Inc. | Other Income (Expense), Net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation costs			$ 76.3

[1] The components of Other Comprehensive Income (Loss) are net of any related income tax effects.