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Long-Term Assets - Preliminary Summary of the Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 29, 2018	[1]	Jan. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,409.4			$ 1,401.3
Lear FAWSN
Business Acquisition [Line Items]
Property, plant and equipment			$ 11.0
Other assets and liabilities assumed, net			7.2
Goodwill			20.9
Intangible assets			7.5
Assets acquired and liabilities assumed			$ 46.6
[1] Unaudited.

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets And Other Liabilities, Net

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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