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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information [Line Items]
Loss on extinguishment of debt		$ (21.2)							$ 21.2	$ 0.0	$ 14.3
Net tax benefits	$ 30.2	14.0	$ 35.3	$ 19.1	$ 9.1	$ 2.4	$ 7.1	$ 5.0
Income tax expense (benefit)									(197.5)	(370.2)	(285.5)
Transition tax on accumulated foreign earnings	131.0								$ 131.0	$ 0.0	$ 0.0
U.S. corporate tax rate									35.00%	35.00%	35.00%
U.S. | Pension
Quarterly Financial Information [Line Items]
Pension settlement gain (loss)					$ (34.2)				$ (0.2)	$ (34.4)	$ (0.2)
Foreign Tax Authority
Quarterly Financial Information [Line Items]
Income tax expense (benefit)	289.7
State and Local Jurisdiction
Quarterly Financial Information [Line Items]
Income tax expense (benefit)	146.4
U.S.
Quarterly Financial Information [Line Items]
Income tax expense (benefit)	$ (42.5)
Beijing BAI Lear Automotive Systems Co., Ltd.
Quarterly Financial Information [Line Items]
Consolidation of affiliate, revaluation gain		$ 54.2					$ 30.3		$ 30.3

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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