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Net Earnings per Common Share | 12 Months Ended
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Dec. 31, 2022
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) |  | 2022 |  | 2021 |  | 2020
Basic Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.9 |
Distributed and allocated undistributed net earnings to unvested restricted stockholders |  | — |  |  | — |  |  | (0.2) |
Net earnings available to common stockholders |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.7 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 145.9 |  |  | 150.9 |  |  | 155.2 |
Basic net earnings per common share: |  |  |  |  |  |
Basic net earnings per common share |  | $ | 3.37 |  |  | $ | 3.36 |  |  | $ | 3.24 |
Diluted Net Earnings Per Common Share: |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Net earnings available to common stockholders |  | $ | 491.6 |  |  | $ | 506.8 |  |  | $ | 502.7 |
Denominator: |  |  |  |  |  |
Weighted average number of common shares outstanding - basic |  | 145.9 |  |  | 150.9 |  |  | 155.2 |
Effect of dilutive stock shares and units |  | 1.5 |  |  | 1.5 |  |  | 0.8 |
Weighted average number of common shares outstanding - diluted under treasury stock |  | 147.4 |  |  | 152.4 |  |  | 156.0 |
Diluted net earnings per common share |  | $ | 3.33 |  |  | $ | 3.32 |  |  | $ | 3.22 |
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 0.8 million in 2022, 0.6 million in 2021, and nominal in 2020. SLO Awards The shares or units associated with the 2022 SLO awards are considered contingently issuable shares and therefore are not included in the basic or diluted weighted average number of common shares outstanding for the year ended December 31, 2022. These shares or units will not be included in the common shares outstanding until the final determination of the amount of annual incentive compensation is made in the first quarter of 2023. Once this determination is made, the shares or units will be included in diluted weighted average number of common shares outstanding if the impact to diluted net earnings per common share is dilutive. The shares or units associated with SLO awards for 2022, 2021 and 2020 were nominal.

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