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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2024
EARNINGS PER SHARE |
EARNINGS PER SHARE | 12. EARNINGS PER SHARE ​ Basic earnings per share is determined by dividing net income by the weighted average common shares outstanding during the period. The calculation of diluted earnings per share includes the dilutive effect of unexercised non-qualified stock options and non-vested restricted stock units. The computation of weighted average common shares outstanding excluded a nominal amount of anti-dilutive non-qualified stock options for each period ended March 31, 2024 and 2023. ​ The computations for basic and diluted earnings per share for the three months ended March 31, 2024 and 2023 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2024 | ​ | Three Months Ended March 31, 2023 | ​
​ |  | ​ | ​ |  | Weighted |  | Per |  | ​ | ​ |  | Weighted |  | Per |
​ | ​ | ​ | ​ | ​ | Average | ​ | Common | ​ | ​ | ​ | ​ | Average | ​ | Common |
​ | ​ | Net | ​ | Common | ​ | Share | ​ | Net | ​ | Common | ​ | Share |
(In millions, except per share amounts) | ​ | Income | ​ | Shares | ​ | Amount | ​ | Income | ​ | Shares | ​ | Amount |
Basic: | ​ | $ | 36.1 |  | 34.4 | ​ | $ | 1.05 | ​ | $ | 34.0 |  | 36.1 | ​ | $ | 0.94 | ​
Effect of Dilutive Securities: | ​ | ​ | — |  | 0.2 | ​ | ​ | (0.01) | ​ | ​ | — |  | 0.2 | ​ | ​ | — | ​
Diluted: | ​ | $ | 36.1 | ​ | 34.6 | ​ | $ | 1.04 | ​ | $ | 34.0 | ​ | 36.3 | ​ | $ | 0.94 | ​
​

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
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