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Long-Term Assets - Investment in Affiliates Additional Information (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 07, 2017	Sep. 30, 2017		Oct. 01, 2016	Sep. 30, 2017		Oct. 01, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Consolidation of affiliate, revaluation gain							$ 30.3
Redeemable noncontrolling interest		$ 147.7	[1]		$ 147.7	[1]		$ 0.0
Noncontrolling interest, change in redemption value		22.7			22.7
Annual sales		4,981.5		$ 4,526.4	$ 15,103.2		$ 13,914.1
Shanghai Lear Stec Automotive Parts Co Limited
Business Acquisition [Line Items]
Fair value of previously held equity interest	$ 94.0
Fair value of the noncontrolling interest	$ 125.0
Consolidation of affiliate, revaluation gain		$ 54.2
Noncontrolling interest, ownership percentage by noncontrolling owners		45.00%			45.00%
Annual sales								$ 280.0
Shanghai Lear Stec Automotive Parts Co Limited | Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets, weighted average useful life	12 years
Other Income And Expense [Member] | Shanghai Lear Stec Automotive Parts Co Limited
Business Acquisition [Line Items]
Consolidation of affiliate, revaluation gain		$ 54.2			$ 54.2
[1] Unaudited.

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