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Long-Term Assets - Investment in Affiliates (Details) - USD ($) $ in Millions	Sep. 30, 2017	[1]	Sep. 07, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 1,387.1			$ 1,121.3
Shanghai Lear Stec Automotive Parts Co Limited
Business Acquisition [Line Items]
Property, plant and equipment			$ 16.2
Other assets and liabilities assumed, net			42.7
Goodwill			94.1
Preliminary purchase price allocation			219.0
Shanghai Lear Stec Automotive Parts Co Limited | Customer relationships
Business Acquisition [Line Items]
Intangible assets			$ 66.0
[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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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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