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Earnings (Loss) per Share | 9 Months Ended
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Sep. 30, 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 common shares and potentially dilutive common shares outstanding for the period. The calculation of diluted net income per share excludes all antidilutive common shares.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
In millions, except share and per share data | 2022 |  | 2021 |  | 2022 |  | 2021
Net income (loss) | $ | 75.4 |  |  | $ | (4.2) |  |  | $ | 196.0 |  |  | $ | 88.8 |
Basic and Diluted earnings (loss) per share |  |  |  |  |  |  |
Basic earnings (loss) per share | $ | 1.99 |  |  | $ | (0.11) |  |  | $ | 5.10 |  |  | $ | 2.22 |
Diluted earnings (loss) per share | 1.98 |  |  | (0.11) |  |  | 5.06 |  |  | 2.21 |
Shares (in thousands) |  |  |  |  |  |  |
Weighted average number of common shares outstanding - Basic | 37,839 |  |  | 39,537 |  |  | 38,451 |  |  | 39,993 |
Weighted average additional shares assuming conversion of potential common shares (1) | 295 |  |  | — |  |  | 269 |  |  | 245 |
Shares - diluted basis (1) | 38,134 |  |  | 39,537 |  |  | 38,720 |  |  | 40,238 |
_______________ (1) For the three months ended September 30, 2021, all potentially dilutive common shares were excluded from the calculation of diluted earnings (loss) per share as we had a net loss for the period. The following average number of potential common shares were antidilutive, and therefore, were not included in the diluted earnings per share calculation:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2022 |  | 2021 |  | 2022 |  | 2021
Average number of potential common shares - antidilutive | 209 |  |  | 375 |  |  | 204 |  |  | 200 |

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