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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Jan. 31, 2018	Sep. 30, 2017	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary			$ 11.1								$ (52.4)	$ (56.8)	$ (44.2)
Tax benefit on share-based compensation						$ 10.1
Tax benefit on restructuring charges and various other items			8.6	$ 7.5		4.1
Tax expense on increase in foreign withholding tax on certain undistributed foreign earnings						22.0					0.0	(289.7)	0.0
Favorable settlements			$ 15.8		$ 17.4						(6.9)	1.4	1.8
Tax benefit on tax rate change											(9.8)	(42.5)	0.0
Income tax expense (benefit)											311.9	197.5	370.2
Loss on extinguishment of debt								$ (21.2)			0.0	21.2	0.0
Net tax benefits							$ 30.2	$ 14.0	$ 35.3	$ 19.1
Transition tax on accumulated foreign earnings							131.0				(15.1)	$ 131.0	0.0
Foreign Tax Authority
Quarterly Financial Information [Line Items]
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary						(35.1)
Tax benefit on tax rate change				7.2
Income tax expense (benefit)							(289.7)
U.S.
Quarterly Financial Information [Line Items]
Tax benefits on adjustment to 2017 provisional U.S. income tax expense				$ 6.9
Income tax expense (benefit)							42.5
State and Local Jurisdiction
Quarterly Financial Information [Line Items]
Income tax expense (benefit)							(146.4)
Lear FAWSN
Quarterly Financial Information [Line Items]
Consolidation of affiliate, revaluation gain	$ 10.0					$ 10.0
Lear STEC
Quarterly Financial Information [Line Items]
Consolidation of affiliate, revaluation gain		$ 54.2					$ 54.2
Pension | United States
Quarterly Financial Information [Line Items]
Settlement charge											$ 5.4		$ 34.2

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