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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 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 share (in millions, except per share data):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Earnings per common share—basic |  |  |  |  |
Net income | $ | 95.0 |  |  | $ | 157.9 |  |  | $ | 322.0 |
Weighted-average common shares outstanding—basic | 185.0 |  |  | 184.9 |  |  | 169.1 |
Earnings per common share—basic | $ | 0.51 |  |  | $ | 0.85 |  |  | $ | 1.90 |
Earnings per common share—diluted |  |  |  |  |
Net income | $ | 95.0 |  |  | $ | 157.9 |  |  | $ | 322.0 |
Interest expense | 6.5 |  |  | 6.4 |  |  | — |
Net income attributable to earnings per common share—diluted | $ | 101.5 |  |  | $ | 164.3 |  |  | $ | 322.0 |
Weighted-average common shares outstanding—basic | 185.0 |  |  | 184.9 |  |  | 169.1 |
Weighted-average shares outstanding - Convertible Notes(1) | 14.7 |  |  | 14.7 |  |  | 5.9 |
Outstanding options, restricted stock units and performance share units | 1.4 |  |  | 1.7 |  |  | 1.9 |
Weighted-average common shares outstanding—diluted | 201.1 |  |  | 201.3 |  |  | 176.9 |
Earnings per common share—diluted | $ | 0.50 |  |  | $ | 0.82 |  |  | $ | 1.82 |
(1) For 2021, the Dilutive impact of the Convertible Notes was calculated using the Treasury Stock Method. See Note 3 for further detail.

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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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