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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020 (in millions, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 105.5 | ​ | $ | 113.6 | ​ | $ | 242.7 | ​ | $ | 271.0
Earnings allocated to participating securities | ​ |  | (0.3) | ​ |  | (0.3) | ​ |  | (0.7) | ​ |  | (0.7)
Net income allocated to common stockholders | ​ | $ | 105.2 | ​ | $ | 113.3 | ​ | $ | 242.0 | ​ | $ | 270.3
Basic earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 106.8 | ​ | ​ | 109.5 | ​ | ​ | 107.1 | ​ | ​ | 109.9
Basic earnings per share | ​ | $ | 0.99 | ​ | $ | 1.04 | ​ | $ | 2.26 | ​ | $ | 2.46
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 105.5 | ​ | $ | 113.6 | ​ | $ | 242.7 | ​ | $ | 271.0
Earnings allocated to participating securities | ​ |  | (0.3) | ​ |  | (0.3) | ​ |  | (0.7) | ​ |  | (0.7)
Net income allocated to common stockholders | ​ | $ | 105.2 | ​ | $ | 113.3 | ​ | $ | 242.0 | ​ | $ | 270.3
Diluted earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 106.8 | ​ | ​ | 109.5 | ​ | ​ | 107.1 | ​ | ​ | 109.9
Dilutive potential common shares outstanding | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | 0.2 | ​ | ​ | 0.2
Total dilutive weighted average shares | ​ | ​ | 106.9 | ​ | ​ | 109.6 | ​ | ​ | 107.3 | ​ | ​ | 110.1
Diluted earnings per share | ​ | $ | 0.98 | ​ | $ | 1.03 | ​ | $ | 2.26 | ​ | $ | 2.45

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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