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Net Income (Loss) Per Share Attributable to Lear (Tables) | 9 Months Ended
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Oct. 02, 2021
Earnings Per Share [Abstract] |
Summary of Information Used to Compute Basic and Diluted Net Income (Loss) Per Share | A summary of information used to compute basic and diluted net income (loss) per share available to Lear common stockholders is shown below (in millions, except share and per share data):
| Three Months Ended |  | Nine Months Ended
| October 2, 2021 |  | October 3, 2020 |  | October 2, 2021 |  | October 3, 2020
Net income (loss) available to Lear | $ | (26.5) |  |  | $ | 174.4 |  |  | $ | 352.4 |  |  | $ | (43.1) |
Average common shares outstanding | 59,906,531 |  |  | 60,159,356 |  |  | 60,171,402 |  |  | 60,260,886 |
Dilutive effect of common stock equivalents | — |  |  | 171,585 |  |  | 291,999 |  |  | — |
Average diluted shares outstanding | 59,906,531 |  |  | 60,330,941 |  |  | 60,463,401 |  |  | 60,260,886 |
Basic net income (loss) per share available to Lear common stockholders | $ | (0.44) |  |  | $ | 2.90 |  |  | $ | 5.86 |  |  | $ | (0.72) |
Diluted net income (loss) per share available to Lear common stockholders | $ | (0.44) |  |  | $ | 2.89 |  |  | $ | 5.83 |  |  | $ | (0.72) |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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