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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2024
EARNINGS PER SHARE |
EARNINGS PER SHARE | 14.EARNINGS PER SHARE ​ Basic earnings per share are determined by dividing net income by the weighted-average common shares outstanding during the year. The calculation of diluted earnings per share includes the dilutive effect of unvested restricted stock units. The computation of weighted average common shares excluded a nominal amount of anti-dilutive restricted stock units for each of the years 2024, 2023 and 2022. ​ The computations for basic and diluted earnings per share for the years ended December 31, 2024, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2024 | ​ | Year Ended December 31, 2023 | ​ | Year Ended December 31, 2022
​ |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per
​ | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common
​ | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share
(In millions, except per share amounts) | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount
Basic: | ​ | $ | 476.4 |  | 33.7 | ​ | $ | 14.14 | ​ | $ | 297.1 |  | 35.3 | ​ | $ | 8.42 | ​ | $ | 1,063.9 |  | 39.0 | ​ | $ | 27.28
Effect of Dilutive Securities: | ​ | ​ | — |  | 0.5 | ​ | ​ | (0.21) | ​ | ​ | — |  | 0.4 | ​ | ​ | (0.10) | ​ | ​ | — |  | 0.3 | ​ | ​ | (0.21)
Diluted: | ​ | $ | 476.4 | ​ | 34.2 | ​ | $ | 13.93 | ​ | $ | 297.1 | ​ | 35.7 | ​ | $ | 8.32 | ​ | $ | 1,063.9 | ​ | 39.3 | ​ | $ | 27.07
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