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Basic and Diluted Net Loss Per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Loss Per Share | Basic and diluted net income (loss) attributable to SGC per share is based upon net income (loss) attributable to SGC divided by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects the effect of the assumed exercise of stock options and RSUs only in the periods in which such effect would have been dilutive. The below table presents a reconciliation of weighted average shares used in the calculation of basic and diluted earnings per share.
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Weighted average shares for basic earnings per share | 96 |  |  | 95 |  |  | 93 |
Stock options | 1 |  |  | — |  |  | — |
RSUs | 1 |  |  | — |  |  | — |
Weighted average shares for diluted earnings per share | 98 |  |  | 95 |  |  | 93 |
We excluded 2 million and 1 million stock options from the calculation of diluted weighted-average net loss attributable to SGC per share for the years ended December 31, 2020 and 2019, respectively, which would be anti-dilutive due to the net loss from continuing operations in those periods. In addition, we excluded 3 million RSUs from the calculation of diluted weighted-average net loss attributable to SGC per share for each of the years ended December 31, 2020 and 2019, which would be anti-dilutive due to the net loss from continuing operations in those periods.

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