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Pre-Production Costs Related to Long-Term Supply Agreements - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jul. 04, 2020 | Jun. 29, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer | $ 91.8 | $ 125.8
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer | 90.0 | 91.3
Cash collected related to E&D and tooling costs | $ 127.8 | $ 163.7

X
- Definition Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
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X
- Definition Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period. + References No definition available. + Details
Name: | lear_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Namespace Prefix: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer. + References No definition available. + Details
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Namespace Prefix: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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