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Pre-Production Costs Related to Long-Term Supply Agreements - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
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Oct. 03, 2020 | Sep. 28, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer | $ 111.1 | $ 174.8
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer | 130.2 | 126.7
Cash collected related to E&D and tooling costs | $ 184.5 | $ 243.5

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- 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: | lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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