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Summary of Comprehensive Income (Loss) and Reconciliations of Equity (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 33 Months Ended
--- | --- | --- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 28, 2013 | Sep. 29, 2012 | Sep. 28, 2013
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning equity balance | $ 2,790.3 |  | $ 2,700.5 |  | $ 3,612.2 |  | $ 2,561.1 |  |  |
Stock-based compensation transactions | 14.2 |  | 8.8 |  | 36.0 |  | 22.8 |  |  |
Repurchase of common stock |  |  | (50.1) |  | (1,000.1) |  | (172.6) |  | (1,500.0) |
Dividends declared to Lear Corporation stockholders | (14.2) |  | (13.9) |  | (44.8) |  | (42.3) |  |  |
Dividends paid to noncontrolling interests | (18.6) |  |  |  | (33.4) |  | (4.3) |  |  |
Acquisition of noncontrolling interests |  |  | (17.4) |  | (6.6) |  | (23.6) |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income | 116.7 |  | 128.1 |  | 375.9 |  | 427.1 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |
Defined benefit plan adjustments | 1.8 | [1] | 2.6 | [2] | 5.5 | [1] | 0.8 | [2] |  |
Derivative instruments and hedging activities | (5.3) | [3] | 18.0 | [4] | (14.1) | [3] | 54.0 | [4] |  |
Foreign currency translation adjustments | 35.1 |  | 25.6 |  | (10.6) |  | (20.8) |  |  |
Other comprehensive income (loss) | 31.6 |  | 46.2 |  | (19.2) |  | 34.0 |  |  |
Comprehensive income | 148.3 |  | 174.3 |  | 356.7 |  | 461.1 |  |  |
Ending equity balance | 2,920.0 | [5] | 2,802.2 |  | 2,920.0 | [5] | 2,802.2 |  | 2,920.0 | [5]
Parent |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning equity balance | 2,669.3 |  | 2,565.5 |  | 3,487.1 |  | 2,436.4 |  |  |
Stock-based compensation transactions | 14.2 |  | 8.8 |  | 36.0 |  | 22.8 |  |  |
Repurchase of common stock |  |  | (50.1) |  | (1,000.1) |  | (172.6) |  |  |
Dividends declared to Lear Corporation stockholders | (14.2) |  | (13.9) |  | (44.8) |  | (42.3) |  |  |
Acquisition of noncontrolling interests |  |  | (9.3) |  | (3.2) |  | (11.5) |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income | 112.8 |  | 121.4 |  | 358.6 |  | 400.9 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |
Defined benefit plan adjustments | 1.8 | [1] | 2.6 | [2] | 5.5 | [1] | 0.8 | [2] |  |
Derivative instruments and hedging activities | (5.3) | [3] | 18.0 | [4] | (14.1) | [3] | 54.0 | [4] |  |
Foreign currency translation adjustments | 34.9 |  | 24.4 |  | (11.5) |  | (21.1) |  |  |
Other comprehensive income (loss) | 31.4 |  | 45.0 |  | (20.1) |  | 33.7 |  |  |
Comprehensive income | 144.2 |  | 166.4 |  | 338.5 |  | 434.6 |  |  |
Ending equity balance | 2,813.5 |  | 2,667.4 |  | 2,813.5 |  | 2,667.4 |  | 2,813.5 |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Beginning equity balance | 121.0 |  | 135.0 |  | 125.1 |  | 124.7 |  |  |
Dividends paid to noncontrolling interests | (18.6) |  |  |  | (33.4) |  | (4.3) |  |  |
Acquisition of noncontrolling interests |  |  | (8.1) |  | (3.4) |  | (12.1) |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income | 3.9 |  | 6.7 |  | 17.3 |  | 26.2 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments | 0.2 |  | 1.2 |  | 0.9 |  | 0.3 |  |  |
Other comprehensive income (loss) | 0.2 |  | 1.2 |  | 0.9 |  | 0.3 |  |  |
Comprehensive income | 4.1 |  | 7.9 |  | 18.2 |  | 26.5 |  |  |
Ending equity balance | $ 106.5 |  | $ 134.8 |  | $ 106.5 |  | $ 134.8 |  | $ 106.5 |
[1] | Includes comprehensive income of $2.6 million and $7.8 million for the three and nine months ended September 28, 2013, respectively, reclassified from accumulated other comprehensive loss. See Note 8, "Pension and Other Postretirement Benefit Plans."
[2] | Includes comprehensive income of $2.5 million and $8.1 million for the three and nine months ended September 29, 2012, respectively, reclassified from accumulated other comprehensive loss. See Note 8, "Pension and Other Postretirement Benefit Plans."
[3] | Includes comprehensive loss of $8.3 million and $27.1 million for the three and nine months ended September 28, 2013, respectively, reclassified from accumulated other comprehensive loss. See Note 15, "Financial Instruments."
[4] | Includes comprehensive income (loss) of ($0.3) million and $5.8 million for the three and nine months ended September 29, 2012, respectively, reclassified from accumulated other comprehensive loss. See Note 15, "Financial Instruments."
[5] | Unaudited.

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