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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 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 (in millions, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
Basic earnings per share numerator: |  | ​ |  |  | ​ |  | ​ | ​ |
Net income | ​ | $ | 529.0 | ​ | $ | 468.2 | ​ | $ | 370.8
Net loss attributable to noncontrolling interest | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4.1
Net income excluding redeemable noncontrolling interest | ​ |  | 529.0 | ​ |  | 468.2 | ​ |  | 374.9
Change in redemption value of redeemable noncontrolling interest | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.5)
Net income allocated to participating securities | ​ |  | (1.7) | ​ |  | (1.2) | ​ |  | (1.7)
Net income allocated to common stockholders | ​ | $ | 527.3 | ​ | $ | 467.0 | ​ | $ | 372.7
Basic earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 107.0 | ​ | ​ | 109.1 | ​ | ​ | 111.4
Basic earnings per share | ​ | $ | 4.93 | ​ | $ | 4.28 | ​ | $ | 3.35
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 529.0 | ​ | $ | 468.2 | ​ | $ | 370.8
Net loss attributable to redeemable noncontrolling interest | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4.1
Net income excluding redeemable noncontrolling interest | ​ |  | 529.0 | ​ |  | 468.2 | ​ |  | 374.9
Change in redemption value of redeemable noncontrolling interest | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.5)
Net income allocated to participating securities | ​ |  | (1.7) | ​ |  | (1.2) | ​ |  | (1.7)
Net income allocated to common stockholders | ​ | $ | 527.3 | ​ | $ | 467.0 | ​ | $ | 372.7
Diluted earnings per share denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average shares outstanding | ​ | ​ | 107.0 | ​ | ​ | 109.1 | ​ | ​ | 111.4
Dilutive common shares issued under stock program | ​ | ​ | 0.2 | ​ | ​ | 0.2 | ​ | ​ | 0.4
Total dilutive weighted average shares | ​ | ​ | 107.2 | ​ | ​ | 109.3 | ​ | ​ | 111.8
Diluted earnings per share | ​ | $ | 4.92 | ​ | $ | 4.27 | ​ | $ | 3.34

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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=124432515&loc=d3e3550-109257 + Details
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