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Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations |
|  | Quarter ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
|  | (In millions, except per share data) |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 28.4 |  |  | $ | 32.4 |  |  | $ | 30.0 |  |  | $ | 27.4 |
Gross margin |  |  | 9.5 |  |  |  | 11.2 |  |  |  | 9.6 |  |  |  | 7.9 |
Net income (loss) |  |  | 14.7 |  |  |  | (42.0 | ) |  |  | (14.9 | ) |  |  | 3.1 |
Amounts attributable to NL stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 14.2 |  |  | $ | (42.6 | ) |  | $ | (15.4 | ) |  | $ | 2.8 |
Income (loss) per common share |  | $ | .29 |  |  | $ | (.87 | ) |  | $ | (.32 | ) |  | $ | .06 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 31.2 |  |  | $ | 33.7 |  |  | $ | 29.7 |  |  | $ | 29.6 |
Gross margin |  |  | 9.6 |  |  |  | 11.0 |  |  |  | 9.4 |  |  |  | 9.0 |
Net income (loss) |  |  | 15.7 |  |  |  | 6.6 |  |  |  | (1.0 | ) |  |  | 6.7 |
Amounts attributable to NL stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 15.2 |  |  | $ | 5.9 |  |  | $ | (1.6 | ) |  | $ | 6.3 |
Income (loss) per common share |  | $ | .31 |  |  | $ | .12 |  |  | $ | (.03 | ) |  | $ | .13 |

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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=118952077&loc=d3e1280-108306 + Details
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