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Pre-Production Costs Related to Long-Term Supply Agreements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 30, 2019 | Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Pre-production E&D costs for which reimbursement is contractually guaranteed by the customer | $ 58.8 | $ 33.5
Pre-production tooling costs related to customer-owned tools for which reimbursement is contractually guaranteed by the customer | 47.0 | 31.8
Cash collected related to E&D and tooling costs | $ 95.8 | $ 79.0

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
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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: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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