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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
EARNINGS PER SHARE |
Reconciliation of basic and diluted net income per common share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2021 |  | 2020
Basic earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 137.2 | ​ | $ | 157.4
Earnings allocated to participating securities | ​ |  | (0.4) | ​ |  | (0.4)
Net income allocated to common stockholders | ​ | $ | 136.8 | ​ | $ | 157.0
Basic earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 107.3 | ​ | ​ | 110.4
Basic earnings per share | ​ | $ | 1.27 | ​ | $ | 1.42
​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 137.2 | ​ | $ | 157.4
Earnings allocated to participating securities | ​ |  | (0.4) | ​ |  | (0.4)
Net income allocated to common stockholders | ​ | $ | 136.8 | ​ | $ | 157.0
Diluted earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 107.3 | ​ | ​ | 110.4
Dilutive potential common shares outstanding | ​ | ​ | 0.1 | ​ | ​ | 0.2
Total dilutive weighted average shares | ​ | ​ | 107.4 | ​ | ​ | 110.6
Diluted earnings per share | ​ | $ | 1.27 | ​ | $ | 1.42

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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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