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Earnings (Loss) per Share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Earnings (Loss) per Share | Earnings (Loss) per Share Basic earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing net income (loss) for the period by the weighted average number of shares of common stock and potentially dilutive common stock outstanding for the period. The calculation of diluted net income per share excludes all anti-dilutive common shares.
| Years Ended December 31,
In millions (except share and per share data) | 2022 |  | 2021 |  | 2020
Net income (loss) | $ | 211.6 |  |  | $ | 118.1 |  |  | $ | 181.4 |
Basic and Diluted earnings (loss) per share (1) |  |  |  |  |
Basic earnings (loss) per share | $ | 5.54 |  |  | $ | 2.97 |  |  | $ | 4.39 |
Diluted earnings (loss) per share | $ | 5.50 |  |  | $ | 2.95 |  |  | $ | 4.37 |
Shares (2) |  |  |  |  |
Weighted average number of shares of common stock outstanding - Basic | 38,179 |  |  | 39,816 |  |  | 41,330 |
Weighted average additional shares assuming conversion of potential common shares | 292 |  |  | 243 |  |  | 217 |
Shares - diluted basis | 38,471 |  |  | 40,059 |  |  | 41,547 |
_______________ (1) Diluted earnings (loss) per share is calculated using net income (loss) available to common stockholders divided by diluted weighted average shares of common shares outstanding during each period, which includes the dilutive effect of outstanding equity awards. (2) Shares are presented in thousands. The following average number of potential common shares were antidilutive and, therefore, were not included in the diluted earnings per share calculation:
| Years Ended December 31,
In thousands | 2022 |  | 2021 |  | 2020
Average number of potential common shares - antidilutive | 204 |  |  | 98 |  |  | 177 |

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