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Earnings per Share and Stock Repurchase Program (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings per Share and Stock Repurchase Program |
Summary of reconciliation of the calculation of earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | Per | ​ | ​ | ​ | ​ | ​ | ​ | Per | ​ | ​ | ​ | ​ | ​ | ​ | Per
​ | ​ | Net | ​ | ​ | ​ | Share | ​ | Net | ​ | ​ | ​ | Share | ​ | Net | ​ | ​ | ​ | Share
​ |  | Income |  | Shares |  | Amount |  | Income |  | Shares |  | Amount |  | Income |  | Shares |  | Amount
​ | ​ | (Amounts in millions, except per share information)
Basic EPS | ​ | $ | 165.7 | ​ | 33.8 | ​ | $ | 4.90 | ​ | $ | 114.3 | ​ | 33.9 | ​ | $ | 3.37 | ​ | $ | 131.5 | ​ | 34.1 | ​ | $ | 3.86
Dilutive securities, principally common stock options | ​ |  | — | ​ | 0.1 | ​ |  | (0.02) | ​ |  | — | ​ | 0.1 | ​ |  | (0.01) | ​ |  | — | ​ | 0.1 | ​ |  | (0.01)
Diluted EPS | ​ | $ | 165.7 | ​ | 33.9 | ​ | $ | 4.88 | ​ | $ | 114.3 | ​ | 34.0 | ​ | $ | 3.36 | ​ | $ | 131.5 |  | 34.2 | ​ | $ | 3.85

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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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