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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2023
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 years ended December 31, 2023, 2022, and 2021 (in millions, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
Basic earnings per share numerator: |  | ​ |  |  | ​ |  | ​ | ​ |
Net income | ​ | $ | 761.4 | ​ | $ | 235.0 | ​ | $ | 529.0
Net income allocated to participating securities | ​ |  | (3.9) | ​ |  | (0.9) | ​ |  | (1.7)
Net income allocated to common stockholders | ​ | $ | 757.5 | ​ | $ | 234.1 | ​ | $ | 527.3
Basic earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 105.8 | ​ | ​ | 106.3 | ​ | ​ | 107.0
Basic earnings per share | ​ | $ | 7.16 | ​ | $ | 2.20 | ​ | $ | 4.93
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 761.4 | ​ | $ | 235.0 | ​ | $ | 529.0
Net income allocated to participating securities | ​ |  | (3.9) | ​ |  | (0.9) | ​ |  | (1.7)
Net income allocated to common stockholders | ​ | $ | 757.5 | ​ | $ | 234.1 | ​ | $ | 527.3
Diluted earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 105.8 | ​ | ​ | 106.3 | ​ | ​ | 107.0
Dilutive common shares issued under stock program | ​ | ​ | 0.4 | ​ | ​ | 0.4 | ​ | ​ | 0.2
Total dilutive weighted average shares | ​ | ​ | 106.2 | ​ | ​ | 106.7 | ​ | ​ | 107.2
Diluted earnings per share | ​ | $ | 7.13 | ​ | $ | 2.19 | ​ | $ | 4.92

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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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