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Net Earnings per Common Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Net Earnings per Common Share | Net Earnings per Common Share The following table shows the calculation of basic and diluted net earnings per common share:
|  | Year Ended December 31,
(In millions, except per share amounts) |  | 2023 |  | 2022 |  | 2021
Basic Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings |  | $ | 341.6 |  |  | $ | 491.6 |  |  | $ | 506.8 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |  |  | — |
Net earnings available to common stockholders |  | $ | 341.6 |  |  | $ | 491.6 |  |  | $ | 506.8 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 144.4 |  |  | 145.9 |  |  | 150.9 |
Basic net earnings per common share: |  |  |  |  |  |
Basic net earnings per common share |  | $ | 2.37 |  |  | $ | 3.37 |  |  | $ | 3.36 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings available to common stockholders |  | $ | 341.6 |  |  | $ | 491.6 |  |  | $ | 506.8 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 144.4 |  |  | 145.9 |  |  | 150.9 |
Effect of dilutive stock shares and units |  | 0.5 |  |  | 1.5 |  |  | 1.5 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 144.9 |  |  | 147.4 |  |  | 152.4 |
Diluted net earnings per common share |  | $ | 2.36 |  |  | $ | 3.33 |  |  | $ | 3.32 |
PSU Awards We included contingently issuable shares using the treasury stock method for our PSU awards in the diluted weighted average number of common shares outstanding based on the number of contingently issuable shares that would be issued assuming the end of our reporting period was the end of the relevant PSU award contingency period. The calculation of diluted weighted average shares outstanding related to PSUs was 0.2 million in 2023, 0.8 million in 2022, and 0.6 million in 2021. SLO Awards The SLO program was terminated following the 2022 performance year and there are no contingently issuable shares under such program as of December 31, 2023. The dilutive impact associated with SLO awards for 2023, 2022 and 2021 was nominal.

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