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Investments in Affiliates and Other Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 | Jan. 31, 2018 | Sep. 30, 2017 | Sep. 28, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Gain from deconsolidation | $ 4.0 |  |  | $ 4.0 |  |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | $ 118.4 | $ 158.1 |
Noncontrolling interest, change in redemption value |  |  |  |  |  | 37.0 | (10.4) | $ (25.5)
Lear FAWSN |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity interest acquired |  | 20.00% |  |  |  |  |  |
Intangible assets acquired, weighted average useful life |  | 10 years |  |  |  |  |  |
Fair value of previously held equity interest in acquiree |  | $ 23.0 |  |  |  | 23.0 |  |
Noncontrolling interests, fair value |  | 14.0 |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 10.0 |  |  | $ 10.0 |  |  |
Lear STEC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired, weighted average useful life |  |  | 12 years |  |  |  |  |
Fair value of previously held equity interest in acquiree |  |  | $ 94.0 |  |  |  |  |
Noncontrolling interests, fair value |  |  | 125.0 |  |  |  |  |
Consolidation of affiliate, revaluation gain |  |  | $ 54.2 |  |  |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | 118.4 | 158.1 |
Noncontrolling interest, change in redemption value |  |  |  |  |  | $ (37.0) | $ 10.4 |
Lear STEC | Lear STEC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  | 45.00% |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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