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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 |  |
--- | --- | --- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016 | Apr. 01, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | $ 3,463.5 |  | $ 3,144.4 | $ 3,192.9 |  | $ 3,017.7 |  |
Stock-based compensation transactions | 19.3 |  | 18.7 | (6.5) |  | (8.9) |  |
Repurchase of common stock | (126.8) |  | (250.2) | (254.3) |  | (405.0) |  |
Dividends declared to Lear Corporation stockholders | (35.3) |  | (22.5) | (71.0) |  | (45.6) |  |
Dividends declared to noncontrolling interest holders | (15.5) |  | (12.8) | (32.5) |  | (12.8) |  |
Consolidation of affiliate |  |  | 40.0 |  |  | 40.0 |  |
Adoption of ASU 2016-09 (Note 11, Taxes) |  |  |  |  |  |  | $ 0.0 | $ 54.5
Non-controlling interests — other |  |  | 0.0 |  |  | 0.0 |  |
Comprehensive income: |  |  |  |  |  |  |  |
Net income | 327.0 |  | 294.5 | 645.5 |  | 557.0 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |
Defined benefit plan adjustments | (1.9) |  | 1.1 | (1.2) |  | (1.7) |  |
Derivative instruments and hedging activities | 15.9 |  | (13.4) | 68.0 |  | (11.4) |  |
Foreign currency translation adjustments | 110.0 |  | (43.7) | 160.8 |  | 26.8 |  |
Other comprehensive income | 124.0 |  | (56.0) | 227.6 |  | 13.7 |  |
Comprehensive income | 451.0 |  | 238.5 | 873.1 |  | 570.7 |  |
Balance at end of period | 3,756.2 | [1] | 3,156.1 | 3,756.2 | [1] | 3,156.1 |  |
Parent |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | 3,331.0 |  | 3,037.6 | 3,057.2 |  | 2,927.4 |  |
Stock-based compensation transactions | 19.3 |  | 18.7 | (6.5) |  | (8.9) |  |
Repurchase of common stock | (126.8) |  | (250.2) | (254.3) |  | (405.0) |  |
Dividends declared to Lear Corporation stockholders | (35.3) |  | (22.5) | (71.0) |  | (45.6) |  |
Adoption of ASU 2016-09 (Note 11, Taxes) |  |  |  |  |  |  | $ 0.0 | $ 54.5
Non-controlling interests — other |  |  | 0.0 |  |  | (2.2) |  |
Comprehensive income: |  |  |  |  |  |  |  |
Net income | 311.9 |  | 282.4 | 617.7 |  | 530.8 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |
Defined benefit plan adjustments | (1.9) |  | 1.1 | (1.2) |  | (1.7) |  |
Derivative instruments and hedging activities | 15.9 |  | (13.4) | 68.0 |  | (11.4) |  |
Foreign currency translation adjustments | 107.8 |  | (40.9) | 157.5 |  | 29.4 |  |
Other comprehensive income | 121.8 |  | (53.2) | 224.3 |  | 16.3 |  |
Comprehensive income | 433.7 |  | 229.2 | 842.0 |  | 547.1 |  |
Balance at end of period | 3,621.9 |  | 3,012.8 | 3,621.9 |  | 3,012.8 |  |
Noncontrolling Interests |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | 132.5 |  | 106.8 | 135.7 |  | 90.3 |  |
Dividends declared to noncontrolling interest holders | (15.5) |  | (12.8) | (32.5) |  | (12.8) |  |
Consolidation of affiliate |  |  | 40.0 |  |  | 40.0 |  |
Non-controlling interests — other |  |  | 0.0 |  |  | 2.2 |  |
Comprehensive income: |  |  |  |  |  |  |  |
Net income | 15.1 |  | 12.1 | 27.8 |  | 26.2 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |
Foreign currency translation adjustments | 2.2 |  | (2.8) | 3.3 |  | (2.6) |  |
Other comprehensive income | 2.2 |  | (2.8) | 3.3 |  | (2.6) |  |
Comprehensive income | 17.3 |  | 9.3 | 31.1 |  | 23.6 |  |
Balance at end of period | $ 134.3 |  | $ 143.3 | $ 134.3 |  | $ 143.3 |  |
[1] | Unaudited.

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