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Investments in Affiliates and Other Related Party Transactions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 08, 2017	Dec. 31, 2016	Jun. 21, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 1,401.3		$ 1,121.3		$ 1,053.8
Shanghai Lear STEC Automotive Parts Co., Ltd. (China)
Business Acquisition [Line Items]
Property, plant and equipment		$ 16.2
Other assets and liabilities assumed, net		42.4
Goodwill		94.4
Intangible assets		66.0
Purchase price allocation		$ 219.0
Beijing BAI Lear Automotive Systems Co., Ltd.
Business Acquisition [Line Items]
Property, plant and equipment				$ 20.7
Other assets and liabilities assumed, net				42.1
Goodwill				7.2
Intangible assets				34.0
Purchase price allocation				$ 104.0

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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 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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