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Net Income (loss) per common share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Net Income (loss) per common share | Net income (loss) per common share The following table presents the calculation of basic and diluted net income (loss) per common share:
| Year Ended December 31,
2022 |  | 2021 |  | 2020
| (As Restated) |  | (As Revised) |  | (As Revised)
Numerator: |  |  |  |  |
Net income (loss) | $ | (211.6) |  |  | $ | 219.5 |  |  | $ | 305.8 |
Denominator: |  |  |  |  |
Weighted-average number of shares-basic | 50.1 |  |  | 53.5 |  |  | 52.7 |
Dilutive effect of employee incentive plans | — |  |  | 0.6 |  |  | 1.1 |
Weighted-average number of shares-diluted | 50.1 |  |  | 54.1 |  |  | 53.8 |
Net income (loss) per common share - basic | $ | (4.22) |  |  | $ | 4.10 |  |  | $ | 5.80 |
Net income (loss) per common share - diluted | $ | (4.22) |  |  | $ | 4.06 |  |  | $ | 5.68 |
Basic net income (loss) per common share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) per common share is computed using the treasury method by dividing net income by the weighted average number of shares of common stock outstanding during the period, adjusted for the potential dilutive effect of other securities if such securities were converted or exercised and are not anti-dilutive. No adjustment for the potential dilutive effect of dilutive securities is reported for the year ended December 31, 2022 as the effect would have been anti-dilutive due to the Company's net loss. The following table presents the share-based awards that are not considered in the diluted net income (loss) per common share calculation generally because the exercise price of the awards was greater than the average per share closing price during the year ending December 31, 2022, 2021 and 2020. In certain instances, awards may be anti-dilutive even if the average market price exceeds the exercise price when the sum of the assumed proceeds exceeds the difference between the market price and the exercise price.
| Year Ended December 31,
2022 |  | 2021 |  | 2020
Anti-dilutive stock awards | 2.8 |  |  | 1.0 |  |  | — |

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