Supplemental Guarantor Consolidating Financial Statements - Supplemental Guarantor Consolidating Statements of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	48 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	$ 927.8	$ 820.1	$ 729.8
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(424.7)	(460.6)	(458.3)
Cash restricted for use — acquisition of Eagle Ottawa	(350.0)	0	0
Cash restricted for use — acquisition of Eagle Ottawa	0	0	0
Insurance proceeds	0	7.1	19.2
Cash paid for acquisition of Guilford, net of cash acquired	0	0	(243.9)
Other, net	(5.9)	49.6	(4.9)
Net cash used in investing activities	(780.6)	(403.9)	(687.9)
Cash Flows from Financing Activities:
Proceeds from the issuance of senior notes	975.0	500.0	0
Repurchase of senior notes	(327.1)us-gaap_RepaymentsOfUnsecuredDebt	(72.1)us-gaap_RepaymentsOfUnsecuredDebt	(72.1)us-gaap_RepaymentsOfUnsecuredDebt
Payment of debt issuance and other financing costs	(18.1)us-gaap_PaymentsOfDebtIssuanceCosts	(13.4)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Cash restricted for use - repurchase of senior notes	(250.0)us-gaap_IncreaseInRestrictedCash
Repurchase of common stock	(411.4)	(1,000.1)	(222.8)	(1,900.0)
Dividends paid to Lear Corporation stockholders	(65.3)us-gaap_PaymentsOfDividendsCommonStock	(58.4)us-gaap_PaymentsOfDividendsCommonStock	(54.6)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid to noncontrolling interests	(25.9)	(44.0)	(23.1)
Intercompany transactions	0	0	0
Other, net	(38.0)	(10.5)	(23.5)
Net cash used in financing activities	(160.8)	(698.5)	(396.1)
Effect of foreign currency translation	(30.0)	17.8	2.1
Net Change in Cash and Cash Equivalents	(43.6)	(264.5)	(352.1)
Cash and Cash Equivalents as of Beginning of Period	1,137.7	1,402.2	1,754.3
Cash and Cash Equivalents as of End of Period	1,094.1	1,137.7	1,402.2	1,094.1
Lear
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	165.4	174.3	54.8
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(25.6)	(17.9)	(11.3)
Cash restricted for use — acquisition of Eagle Ottawa	(350.0)
Cash restricted for use — acquisition of Eagle Ottawa	352.5	304.1	181.8
Insurance proceeds		0	0
Cash paid for acquisition of Guilford, net of cash acquired			(243.9)
Other, net	(6.8)	43.0	0.4
Net cash used in investing activities	(29.9)	329.2	(73.0)
Cash Flows from Financing Activities:
Proceeds from the issuance of senior notes	975.0	500.0
Repurchase of senior notes	(327.1)	(72.1)	(72.1)
Payment of debt issuance and other financing costs	(18.1)	(13.4)
Cash restricted for use - repurchase of senior notes	(250.0)
Repurchase of common stock	(411.4)	(1,000.1)	(222.8)
Dividends paid to Lear Corporation stockholders	(65.3)	(58.4)	(54.6)
Dividends paid to noncontrolling interests	0	0	0
Intercompany transactions	15.9	6.5	34.9
Other, net	(20.2)	(3.9)	(6.1)
Net cash used in financing activities	(101.2)	(641.4)	(320.7)
Effect of foreign currency translation	0	0	0
Net Change in Cash and Cash Equivalents	34.3	(137.9)	(338.9)
Cash and Cash Equivalents as of Beginning of Period	343.5	481.4	820.3
Cash and Cash Equivalents as of End of Period	377.8	343.5	481.4	377.8
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	177.5	226.0	521.2
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(88.2)	(110.6)	(97.4)
Cash restricted for use — acquisition of Eagle Ottawa	0
Cash restricted for use — acquisition of Eagle Ottawa	(38.9)	(2.4)	10.8
Insurance proceeds		0	0
Cash paid for acquisition of Guilford, net of cash acquired			0
Other, net	15.1	3.8	6.3
Net cash used in investing activities	(112.0)	(109.2)	(80.3)
Cash Flows from Financing Activities:
Proceeds from the issuance of senior notes	0	0
Repurchase of senior notes	0	0	0
Payment of debt issuance and other financing costs	0	0
Cash restricted for use - repurchase of senior notes	0
Repurchase of common stock	0	0	0
Dividends paid to Lear Corporation stockholders	0	0	0
Dividends paid to noncontrolling interests	0	0	0
Intercompany transactions	(65.6)	(116.8)	(440.9)
Other, net	0	0	0
Net cash used in financing activities	(65.6)	(116.8)	(440.9)
Effect of foreign currency translation	0	0	0
Net Change in Cash and Cash Equivalents	(0.1)	0	0
Cash and Cash Equivalents as of Beginning of Period	0.1	0.1	0.1
Cash and Cash Equivalents as of End of Period	0	0.1	0.1	0
Non- guarantors
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	597.5	480.1	174.9
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(310.9)	(332.1)	(349.6)
Cash restricted for use — acquisition of Eagle Ottawa	0
Cash restricted for use — acquisition of Eagle Ottawa	(46.3)	1,090.9	(1,162.0)
Insurance proceeds		7.1	19.2
Cash paid for acquisition of Guilford, net of cash acquired			0
Other, net	(14.2)	2.8	(11.6)
Net cash used in investing activities	(371.4)	768.7	(1,504.0)
Cash Flows from Financing Activities:
Proceeds from the issuance of senior notes	0	0
Repurchase of senior notes	0	0	0
Payment of debt issuance and other financing costs	0	0
Cash restricted for use - repurchase of senior notes	0
Repurchase of common stock	0	0	0
Dividends paid to Lear Corporation stockholders	0	0	0
Dividends paid to noncontrolling interests	(25.9)	(44.0)	(23.1)
Intercompany transactions	(230.2)	(1,342.6)	1,354.3
Other, net	(17.8)	(6.6)	(17.4)
Net cash used in financing activities	(273.9)	(1,393.2)	1,313.8
Effect of foreign currency translation	(30.0)	17.8	2.1
Net Change in Cash and Cash Equivalents	(77.8)	(126.6)	(13.2)
Cash and Cash Equivalents as of Beginning of Period	794.1	920.7	933.9
Cash and Cash Equivalents as of End of Period	716.3	794.1	920.7	716.3
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	(12.6)	(60.3)	(21.1)
Cash Flows from Investing Activities:
Additions to property, plant and equipment	0	0	0
Cash restricted for use — acquisition of Eagle Ottawa	0
Cash restricted for use — acquisition of Eagle Ottawa	(267.3)	(1,392.6)	969.4
Insurance proceeds		0	0
Cash paid for acquisition of Guilford, net of cash acquired			0
Other, net	0	0	0
Net cash used in investing activities	(267.3)	(1,392.6)	969.4
Cash Flows from Financing Activities:
Proceeds from the issuance of senior notes	0	0
Repurchase of senior notes	0	0	0
Payment of debt issuance and other financing costs	0	0
Cash restricted for use - repurchase of senior notes	0
Repurchase of common stock	0	0	0
Dividends paid to Lear Corporation stockholders	0	0	0
Dividends paid to noncontrolling interests	0	0	0
Intercompany transactions	279.9	1,452.9	(948.3)
Other, net	0	0	0
Net cash used in financing activities	279.9	1,452.9	(948.3)
Effect of foreign currency translation	0	0	0
Net Change in Cash and Cash Equivalents	0	0	0
Cash and Cash Equivalents as of Beginning of Period	0	0	0
Cash and Cash Equivalents as of End of Period	$ 0	$ 0	$ 0	$ 0

Intercompany Transactions Proceeds From (Payments For), Financing

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Intercompany Transactions Proceeds From (Payments For), Investing

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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