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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2022
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 unexercised non-qualified stock options and non-vested stock units. The computation of weighted average dilutive shares outstanding excluded a nominal amount of anti-dilutive non-qualified stock options for each of the years 2022, 2021 and 2020. ​ The denominators used to compute basic and diluted earnings per share for the years ended December 31, 2022, 2021 and 2020 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2022 | ​ | Year Ended December 31, 2021 | ​ | Year Ended December 31, 2020 |
​ |  | ​ | ​ |  | 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: | ​ | $ | 1,063.9 |  | 39.0 | ​ | $ | 27.28 | ​ | $ | 927.4 |  | 42.8 | ​ | $ | 21.67 | ​ | $ | 193.1 |  | 43.1 | ​ | $ | 4.48 | ​
Effect of Dilutive Securities: | ​ | ​ | — |  | 0.3 | ​ | ​ | (0.21) | ​ | ​ | — |  | 0.4 | ​ | ​ | (0.20) | ​ | ​ | — |  | 0.4 | ​ | ​ | (0.04) | ​
Diluted: | ​ | $ | 1,063.9 | ​ | 39.3 | ​ | $ | 27.07 | ​ | $ | 927.4 | ​ | 43.2 | ​ | $ | 21.47 | ​ | $ | 193.1 | ​ | 43.5 | ​ | $ | 4.44 | ​
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