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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ 4,554.6 |  | $ 3,463.5 | $ 4,292.6 |  | $ 3,192.9 |  |  |  |
Stock-based compensation transactions |  | 12.5 |  | 19.3 | (18.7) |  | (6.5) |  |  |  |
Repurchase of common stock |  | (140.3) |  | (126.8) | (295.7) |  | (254.3) |  |  |  |
Dividends declared to Lear Corporation stockholders |  | (47.0) |  | (35.3) | (94.7) |  | (71.0) |  |  |  |
Dividends declared to noncontrolling interest holders |  | (39.9) |  | (15.5) | (59.6) |  | (32.5) |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  | $ 0.0 | $ 2.3 | $ 0.0 | $ 54.5
Affiliate transaction |  | 0.0 |  |  | 14.0 |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | (9.2) |  |  | (14.6) |  |  |  |  |  |
Acquisition of outstanding non-controlling interest |  | 0.0 |  |  | (3.4) |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net income |  | 351.2 |  | 327.0 | 721.9 |  | 645.5 |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan adjustments |  | 3.3 |  | (1.9) | 5.6 |  | (1.2) |  |  |  |
Derivative instruments and hedging activities |  | (33.2) |  |  | 4.2 |  |  |  |  |  |
Derivative instruments and hedging activities |  |  |  | 15.9 |  |  | 68.0 |  |  |  |
Foreign currency translation adjustments |  | (224.6) |  | 110.0 | (126.5) |  | 160.8 |  |  |  |
Other comprehensive income (loss) |  | (254.5) |  | 124.0 | (116.7) |  | 227.6 |  |  |  |
Comprehensive income |  | 96.7 |  | 451.0 | 605.2 |  | 873.1 |  |  |  |
Balance at end of period |  | 4,427.4 | [1] | 3,756.2 | 4,427.4 | [1] | 3,756.2 |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | 153.4 |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | (9.2) |  |  | (14.6) |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | [1] | 167.5 |  |  | 167.5 |  |  |  |  |  |
Lear Corporation Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 4,399.4 |  | 3,331.0 | 4,150.5 |  | 3,057.2 |  |  |  |
Stock-based compensation transactions |  | 12.5 |  | 19.3 | (18.7) |  | (6.5) |  |  |  |
Repurchase of common stock |  | (140.3) |  | (126.8) | (295.7) |  | (254.3) |  |  |  |
Dividends declared to Lear Corporation stockholders |  | (47.0) |  | (35.3) | (94.7) |  | (71.0) |  |  |  |
Dividends declared to noncontrolling interest holders |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  | 0.0 | 2.3 | 0.0 | 54.5
Affiliate transaction |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | (9.2) |  |  | (14.6) |  |  |  |  |  |
Acquisition of outstanding non-controlling interest |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net income |  | 331.4 |  | 311.9 | 685.1 |  | 617.7 |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan adjustments |  | 3.3 |  | (1.9) | 5.6 |  | (1.2) |  |  |  |
Derivative instruments and hedging activities |  | (33.2) |  |  | 4.2 |  |  |  |  |  |
Derivative instruments and hedging activities |  |  |  | 15.9 |  |  | 68.0 |  |  |  |
Foreign currency translation adjustments |  | (217.0) |  | 107.8 | (124.1) |  | 157.5 |  |  |  |
Other comprehensive income (loss) |  | (246.9) |  | 121.8 | (114.3) |  | 224.3 |  |  |  |
Comprehensive income |  | 84.5 |  | 433.7 | 570.8 |  | 842.0 |  |  |  |
Balance at end of period |  | 4,299.9 |  | 3,621.9 | 4,299.9 |  | 3,621.9 |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | (9.2) |  |  | (14.6) |  |  |  |  |  |
Non- controlling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 155.2 |  | 132.5 | 142.1 |  | 135.7 |  |  |  |
Stock-based compensation transactions |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |
Repurchase of common stock |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |
Dividends declared to Lear Corporation stockholders |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |
Dividends declared to noncontrolling interest holders |  | (39.9) |  | (15.5) | (59.6) |  | (32.5) |  |  |  |
Adoption of ASU |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Affiliate transaction |  | 0.0 |  |  | 14.0 |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Acquisition of outstanding non-controlling interest |  | 0.0 |  |  | (3.4) |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  |
Net income |  | 19.8 |  | 15.1 | 36.8 |  | 27.8 |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan adjustments |  | 0.0 |  | 0.0 | 0.0 |  | 0.0 |  |  |  |
Derivative instruments and hedging activities |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Derivative instruments and hedging activities |  |  |  | 0.0 |  |  | 0.0 |  |  |  |
Foreign currency translation adjustments |  | (7.6) |  | 2.2 | (2.4) |  | 3.3 |  |  |  |
Other comprehensive income (loss) |  | (7.6) |  | 2.2 | (2.4) |  | 3.3 |  |  |  |
Comprehensive income |  | 12.2 |  | 17.3 | 34.4 |  | 31.1 |  |  |  |
Balance at end of period |  | 127.5 |  | $ 134.3 | 127.5 |  | $ 134.3 |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 0.0 |  |  | 0.0 |  |  |  |  |  |
Redeemable Non-controlling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 9.2 |  |  | 14.6 |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 170.3 |  |  | 153.4 |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 9.2 |  |  | 14.6 |  |  |  |  |  |
Dividends declared to noncontrolling interest holders |  | (4.7) |  |  | (4.7) |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Net income |  | 3.8 |  |  | 7.3 |  |  |  |  |  |
Foreign currency translation adjustments |  | (11.1) |  |  | (3.1) |  |  |  |  |  |
Comprehensive income (loss) |  | (7.3) |  |  | 4.2 |  |  |  |  |  |
Balance at end of period |  | $ 167.5 |  |  | $ 167.5 |  |  |  |  |  |
[1] | Unaudited.

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