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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2023
Earnings Per Share [Abstract] |
Summary of Computation of Basic and Diluted Earnings Per Share | The following table summarizes the computation of basic and diluted earnings per common share (in millions, except per share data):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2023 |  | 2022
Earnings per common share—basic |  |  |  |  |  |  |
Net income |  |  |  |  | $ | 25.0 |  |  | $ | 86.7 |
Weighted-average common shares outstanding—basic |  |  |  |  | 185.2 |  |  | 185.1 |
Earnings per common share—basic |  |  |  |  | $ | 0.13 |  |  | $ | 0.47 |
Earnings per common share—diluted |  |  |  |  |  |  |
Net income |  |  |  |  | $ | 25.0 |  |  | $ | 86.7 |
Interest expense(1) |  |  |  |  | 1.6 |  |  | 1.6 |
Net income attributable to earnings per common share—diluted |  |  |  |  | $ | 26.6 |  |  | $ | 88.3 |
Weighted-average common shares outstanding—basic |  |  |  |  | 185.2 |  |  | 185.1 |
Convertible Notes weighted-average common shares outstanding(1) |  |  |  |  | 14.7 |  |  | 14.7 |
Outstanding options, restricted stock units and performance share units |  |  |  |  | 1.6 |  |  | 1.0 |
Weighted-average common shares outstanding—diluted |  |  |  |  | 201.5 |  |  | 200.8 |
Earnings per common share—diluted |  |  |  |  | $ | 0.13 |  |  | $ | 0.44 |
(1) The If-converted method is used for calculating the dilutive weighted-average shares outstanding related to the Convertible Notes when calculating earnings per common share-diluted. Under this method, interest expense related to the Convertible Notes for the period presented is excluded from net income.

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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