Discontinued Operations - Additional Information (Detail) - Veoneer, Inc. - USD ($) $ in Millions		9 Months Ended
	Jun. 29, 2018	Sep. 30, 2018
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
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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spin-off completion date	Jun. 29, 2018
Separation costs		$ 79.4
Cash	$ 1,000.0	8.0
Net assets	2,129.0	2,121.0
Accumulated other comprehensive loss	13.0
Non-controlling interest	112.0
Reduction to retained earnings	$ 2,030.0
Spin-off | Other Income (Expense), Net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation costs		$ 70.9