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Quarterly Information (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Quarterly Information (Unaudited) | Quarterly Information (Unaudited) Financial results by quarter for the years ended December 31, 2019 and 2018 are as follows:
| Net sales |  | Gross profit (loss) |  | Net income (loss) |  | Net income (loss) allocated to common stockholders |  | Basic earnings (loss) per share |  | Diluted earnings (loss) per share
2019 |  |  |  |  |  |  |  |  |  |  |
4th Quarter | $ | 435.5 |  |  | $ | 6.7 |  |  | $ | (4.8 | ) |  | $ | (4.8 | ) |  | $ | (0.05 | ) |  | $ | (0.05 | )
3rd Quarter | 438.0 |  |  | (13.7 | ) |  | (20.7 | ) |  | (20.7 | ) |  | (0.23 | ) |  | (0.23 | )
2nd Quarter (4) | 473.1 |  |  | (4.1 | ) |  | (20.7 | ) |  | (20.7 | ) |  | (0.23 | ) |  | (0.23 | )
1st Quarter | 490.0 |  |  | (12.8 | ) |  | (34.6 | ) |  | (34.6 | ) |  | (0.39 | ) |  | (0.39 | )
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4th Quarter (1) | $ | 486.9 |  |  | $ | (59.3 | ) |  | $ | (65.0 | ) |  | $ | (65.0 | ) |  | $ | (0.74 | ) |  | $ | (0.74 | )
3rd Quarter (2) | 481.8 |  |  | (11.8 | ) |  | (20.3 | ) |  | (20.3 | ) |  | (0.23 | ) |  | (0.23 | )
2nd Quarter (3) | 470.0 |  |  | 33.7 |  |  | 19.4 |  |  | 17.9 |  |  | 0.20 |  |  | 0.20 |
1st Quarter | 454.5 |  |  | 14.5 |  |  | (0.3 | ) |  | (0.3 | ) |  | (0.00) |  |  | (0.00) |
(1) | The fourth quarter of 2018 was unfavorably impacted by realization of a lower of cost or net realizable value adjustment of $30.6 million.
(2) | The third quarter of 2018 was favorably impacted by a $4.5 million gain on the extinguishment of the remainder of our contractual commitments associated with the construction of the Helguvik project.
(3) | The second quarter of 2018 reflects our temporary curtailment of one potline at our Sebree aluminum smelter due to an equipment failure that was brought back online in the third quarter.
(4) The second quarter of 2019 includes a $4.3 million loss incurred from the sale of our interest in BHH.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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