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Earnings per Share and Stock Repurchase Program (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings per Share and Stock Repurchase Program |
Summary of reconciliation of the calculation of earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 262.1 | ​ | 33.4 | ​ | $ | 7.85 | ​ | $ | 251.5 | ​ | 33.5 | ​ | $ | 7.51 | ​ | $ | 165.7 | ​ | 33.8 | ​ | $ | 4.90
Dilutive securities, principally common stock options | ​ |  | — | ​ | 0.1 | ​ |  | (0.03) | ​ |  | — | ​ | 0.1 | ​ |  | (0.03) | ​ |  | — | ​ | 0.1 | ​ |  | (0.02)
Diluted EPS | ​ | $ | 262.1 | ​ | 33.5 | ​ | $ | 7.82 | ​ | $ | 251.5 | ​ | 33.6 | ​ | $ | 7.48 | ​ | $ | 165.7 |  | 33.9 | ​ | $ | 4.88

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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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