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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2022
Earnings Per Share [Abstract] |
Computations of Earnings (Loss) per Common Share | The computations of earnings per common share for the three months ended March 31, 2022 and 2021 were as follows:
(In millions, except per share data) |  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Net income |  | $ | 180.9 |  |  | $ | 177.8 |
Basic earnings per common share |  | $ | 1.36 |  |  | $ | 1.28 |
Diluted earnings per common share |  | $ | 1.34 |  |  | $ | 1.26 |
Basic average shares outstanding |  |  | 133.4 |  |  |  | 138.6 |
Stock-based awards |  |  | 1.3 |  |  |  | 2.0 |
Diluted average shares outstanding |  |  | 134.7 |  |  |  | 140.6 |
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share |  |  | 0.4 |  |  |  | 0.2 |

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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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