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Net Income Per Share Attributable to Lear (Tables) | 3 Months Ended
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Mar. 31, 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
| March 31, 2018 |  | April 1, 2017
Net income attributable to Lear | $ | 353.7 |  |  | $ | 305.8 |
Less: Redeemable noncontrolling interest adjustment | (5.4 | ) |  | — |
Net income available to Lear common stockholders | $ | 348.3 |  |  | $ | 305.8 |
Average common shares outstanding | 67,086,326 |  |  | 69,658,368 |
Dilutive effect of common stock equivalents | 476,126 |  |  | 668,980 |
Average diluted shares outstanding | 67,562,452 |  |  | 70,327,348 |
Basic net income per share available to Lear common stockholders | $ | 5.19 |  |  | $ | 4.39 |
Diluted net income per share available to Lear common stockholders | $ | 5.16 |  |  | $ | 4.35 |

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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://www.xbrl.org/2003/role/presentationRef -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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