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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other long-term assets |  | $ 15.2 | $ 15.2 | $ 12.7 |
Impairment loss |  | 5.0 | 5.0 |  |
Tax benefits (expense) related to derivative instruments and hedging activities recognized in other comprehensive income (loss) |  |  | (5.5) | (3.3) | $ (15.9)
Lear FAWSN |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Noncontrolling interests, fair value | $ 14.0 |  |  |  |
Fair value of previously held equity interest in acquiree | $ 23.0 |  | 23.0 |  |
Level 3 | Lear FAWSN |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Property, plant and equipment, fair value |  | 11.0 | 11.0 | 11.0 |
Intangible assets |  | 7.5 | 7.5 | 7.5 |
Noncontrolling interests, fair value |  | 14.0 | 14.0 | 23.0 |
Foreign exchange contract |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notional amount |  | 2,462.8 | 2,462.8 | 2,153.0 |
Designated as hedging instrument | Foreign exchange contract | Derivative instruments and hedging |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Pretax net losses related to derivative instruments and hedging activities in accumulated other comprehensive loss |  | 19.4 | 19.4 | 1.7 |
Net investment hedging | Designated as hedging instrument |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notional amount |  | 300.0 | 300.0 | 0.0 |
Net investment hedging | Designated as hedging instrument | Interest rate swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notional amount |  | 1.8 | 1.8 |  |
Cash flow hedging | Designated as hedging instrument | Interest rate swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notional amount |  |  |  | 500.0 |
Other current liabilities |  |  |  | 14.7 |
Cash flow hedging | Designated as hedging instrument | Foreign exchange contract |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notional amount |  | 1,465.8 | 1,465.8 | 1,499.0 |
Other current liabilities |  | 4.5 | 4.5 | $ 8.4 |
Estimate of Fair Value Measurement [Member] | Level 3 | Xevo Inc. |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Intangible assets |  | $ 93.2 | $ 93.2 |  |

X
- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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