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Net Income Per Share Attributable to Lear (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Summary of Information Used to Compute Basic and Diluted Net Income Per Share | A summary of information used to compute basic and diluted net income per share available to Lear common stockholders is shown below (in millions, except share and per share data):
| Three Months Ended |  | Six Months Ended
| June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
Net income attributable to Lear | $ | 331.4 |  |  | $ | 311.9 |  |  | $ | 685.1 |  |  | $ | 617.7 |
Less: Redeemable noncontrolling interest adjustment | (9.2 | ) |  | — |  |  | (14.6 | ) |  | — |
Net income available to Lear common stockholders | $ | 322.2 |  |  | $ | 311.9 |  |  | $ | 670.5 |  |  | $ | 617.7 |
Average common shares outstanding | 66,320,362 |  |  | 68,903,958 |  |  | 66,701,228 |  |  | 69,281,163 |
Dilutive effect of common stock equivalents | 387,678 |  |  | 544,840 |  |  | 431,658 |  |  | 606,910 |
Average diluted shares outstanding | 66,708,040 |  |  | 69,448,798 |  |  | 67,132,886 |  |  | 69,888,073 |
Basic net income per share available to Lear common stockholders | $ | 4.86 |  |  | $ | 4.53 |  |  | $ | 10.05 |  |  | $ | 8.92 |
Diluted net income per share available to Lear common stockholders | $ | 4.83 |  |  | $ | 4.49 |  |  | $ | 9.99 |  |  | $ | 8.84 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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