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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | (In millions, except per share data)
| Thirteen Weeks Ended
| March 31, 2018 |  | June 30, 2018 |  | September 29, 2018 |  | December 31, 2018
Net sales | $ | 5,733.7 |  |  | $ | 5,580.8 |  |  | $ | 4,891.6 |  |  | $ | 4,942.4 |
Gross profit | 631.4 |  |  | 638.1 |  |  | 526.3 |  |  | 522.5 |
Consolidated net income | 374.2 |  |  | 355.0 |  |  | 274.7 |  |  | 242.8 |
Net income attributable to Lear | 353.7 |  |  | 331.4 |  |  | 252.5 |  |  | 212.2 |
Basic net income per share attributable to Lear | 5.19 |  |  | 4.86 |  |  | 3.83 |  |  | 3.42 |
Diluted net income per share attributable to Lear | 5.16 |  |  | 4.83 |  |  | 3.80 |  |  | 3.39 |
| Thirteen Weeks Ended
| April 1, 2017 |  | July 1, 2017 |  | September 30, 2017 |  | December 31, 2017
Net sales | $ | 4,998.5 |  |  | $ | 5,123.2 |  |  | $ | 4,981.5 |  |  | $ | 5,363.8 |
Gross profit | 582.5 |  |  | 577.8 |  |  | 555.9 |  |  | 574.9 |
Consolidated net income | 318.5 |  |  | 327.0 |  |  | 315.0 |  |  | 420.4 |
Net income attributable to Lear | 305.8 |  |  | 311.9 |  |  | 295.2 |  |  | 400.5 |
Basic net income per share attributable to Lear | 4.39 |  |  | 4.53 |  |  | 4.00 |  |  | 5.89 |
Diluted net income per share attributable to Lear | 4.35 |  |  | 4.49 |  |  | 3.96 |  |  | 5.80 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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