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Investments in Affiliates and Other Related Party Transactions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,614.3 | $ 1,405.3 |  | $ 1,401.3 |
Lear FAWSN |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Property, plant and equipment |  |  | $ 11.0 |  |
Other assets and liabilities assumed, net |  |  | 5.7 |  |
Goodwill |  |  | 22.4 |  |
Intangible assets |  |  | 7.5 |  |
Purchase price allocation |  |  | $ 46.6 |  |
Lear STEC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 16.2
Other assets and liabilities assumed, net |  |  |  |  | 42.7
Goodwill |  |  |  |  | 94.1
Intangible assets |  |  |  |  | 66.0
Purchase price allocation |  |  |  |  | $ 219.0

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