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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2024
EARNINGS PER SHARE |
Reconciliation of basic and diluted net income per common share | The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2024 and 2023 (in millions, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Basic earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 140.4 | ​ | $ | 167.8 | ​ | $ | 349.9 | ​ | $ | 341.2
Net income allocated to participating securities | ​ |  | (0.7) | ​ |  | (0.8) | ​ |  | (1.9) | ​ |  | (1.6)
Net income allocated to common stockholders | ​ | $ | 139.7 | ​ | $ | 167.0 | ​ | $ | 348.0 | ​ | $ | 339.6
Basic earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 105.1 | ​ | ​ | 105.7 | ​ | ​ | 105.4 | ​ | ​ | 105.8
Basic earnings per share | ​ | $ | 1.33 | ​ | $ | 1.58 | ​ | $ | 3.30 | ​ | $ | 3.21
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 140.4 | ​ | $ | 167.8 | ​ | $ | 349.9 | ​ | $ | 341.2
Net income allocated to participating securities | ​ |  | (0.7) | ​ |  | (0.8) | ​ |  | (1.9) | ​ |  | (1.6)
Net income allocated to common stockholders | ​ | $ | 139.7 | ​ | $ | 167.0 | ​ | $ | 348.0 | ​ | $ | 339.6
Diluted earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 105.1 | ​ | ​ | 105.7 | ​ | ​ | 105.4 | ​ | ​ | 105.8
Dilutive common shares issued under stock program | ​ | ​ | 0.3 | ​ | ​ | 0.4 | ​ | ​ | 0.4 | ​ | ​ | 0.3
Total dilutive weighted average shares | ​ | ​ | 105.4 | ​ | ​ | 106.1 | ​ | ​ | 105.8 | ​ | ​ | 106.1
Diluted earnings per share | ​ | $ | 1.33 | ​ | $ | 1.57 | ​ | $ | 3.29 | ​ | $ | 3.20

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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