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Comprehensive Income and Equity - Summary of Comprehensive Income and Reconciliations of Equity (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 4,292.6 |  | $ 3,192.9 |  |
Stock-based compensation transactions |  | (31.2) |  | (25.8) |  |
Repurchase of common stock |  | (155.4) |  | (127.5) |  |
Dividends declared to Lear Corporation stockholders |  | (47.7) |  | (35.7) |  |
Dividends declared to noncontrolling interest holders |  | (19.7) |  | (17.0) |  |
Adoption of ASU |  |  |  |  | $ 2.3 | $ 54.5
Affiliate transaction |  | 14.0 |  |  |  |
Redeemable non-controlling interest adjustment |  | (5.4) |  |  |  |
Acquisition of outstanding non-controlling interest |  | (3.4) |  |  |  |
Comprehensive income |  |  |  |  |  |
Net income |  | 370.7 |  | 318.5 |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |
Defined benefit plan adjustments |  | 2.3 |  | 0.7 |  |
Derivative instruments and hedging activities |  | 37.4 |  | 52.1 |  |
Foreign currency translation adjustments |  | 98.1 |  | 50.8 |  |
Other comprehensive income (loss) |  | 137.8 |  | 103.6 |  |
Comprehensive income |  | 508.5 |  | 422.1 |  |
Balance at end of period |  | 4,554.6 | [1] | 3,463.5 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 153.4 |  |  |  |
Redeemable non-controlling interest adjustment |  | (5.4) |  |  |  |
Comprehensive income |  |  |  |  |  |
Balance at end of period | [1] | 170.3 |  |  |  |
Lear Corporation Stockholders' Equity |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 4,150.5 |  | 3,057.2 |  |
Stock-based compensation transactions |  | (31.2) |  | (25.8) |  |
Repurchase of common stock |  | (155.4) |  | (127.5) |  |
Dividends declared to Lear Corporation stockholders |  | (47.7) |  | (35.7) |  |
Dividends declared to noncontrolling interest holders |  | 0.0 |  | 0.0 |  |
Adoption of ASU |  |  |  |  | 2.3 | 54.5
Affiliate transaction |  | 0.0 |  |  |  |
Redeemable non-controlling interest adjustment |  | (5.4) |  |  |  |
Acquisition of outstanding non-controlling interest |  | 0.0 |  |  |  |
Comprehensive income |  |  |  |  |  |
Net income |  | 353.7 |  | 305.8 |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |
Defined benefit plan adjustments |  | 2.3 |  | 0.7 |  |
Derivative instruments and hedging activities |  | 37.4 |  | 52.1 |  |
Foreign currency translation adjustments |  | 92.9 |  | 49.7 |  |
Other comprehensive income (loss) |  | 132.6 |  | 102.5 |  |
Comprehensive income |  | 486.3 |  | 408.3 |  |
Balance at end of period |  | 4,399.4 |  | 3,331.0 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | (5.4) |  |  |  |
Non- controlling Interests |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 142.1 |  | 135.7 |  |
Stock-based compensation transactions |  | 0.0 |  | 0.0 |  |
Repurchase of common stock |  | 0.0 |  | 0.0 |  |
Dividends declared to Lear Corporation stockholders |  | 0.0 |  | 0.0 |  |
Dividends declared to noncontrolling interest holders |  | (19.7) |  | (17.0) |  |
Adoption of ASU |  |  |  |  | $ 0.0 | $ 0.0
Affiliate transaction |  | 14.0 |  |  |  |
Redeemable non-controlling interest adjustment |  | 0.0 |  |  |  |
Acquisition of outstanding non-controlling interest |  | (3.4) |  |  |  |
Comprehensive income |  |  |  |  |  |
Net income |  | 17.0 |  | 12.7 |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |
Defined benefit plan adjustments |  | 0.0 |  | 0.0 |  |
Derivative instruments and hedging activities |  | 0.0 |  | 0.0 |  |
Foreign currency translation adjustments |  | 5.2 |  | 1.1 |  |
Other comprehensive income (loss) |  | 5.2 |  | 1.1 |  |
Comprehensive income |  | 22.2 |  | 13.8 |  |
Balance at end of period |  | 155.2 |  | $ 132.5 |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 0.0 |  |  |  |
Redeemable Non-controlling Interests |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Redeemable non-controlling interest adjustment |  | 5.4 |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | 153.4 |  |  |  |
Redeemable non-controlling interest adjustment |  | 5.4 |  |  |  |
Comprehensive income |  |  |  |  |  |
Net income |  | 3.5 |  |  |  |
Foreign currency translation adjustments |  | 8.0 |  |  |  |
Comprehensive income |  | 11.5 |  |  |  |
Balance at end of period |  | $ 170.3 |  |  |  |
[1] | Unaudited.

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