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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per common share | The following table shows the computation of our basic and diluted earnings per common share (in millions, except per share amounts):
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2023 |  | 2022 |  | 2023 |  | 2022
Basic earnings per share: |  |  |  |  |  |  |
Net income | $ | 63.3 |  |  | $ | 2.6 |  |  | $ | 140.7 |  |  | $ | 78.4 |
Less: Net income allocated to participating securities | (1.3) |  |  | — |  |  | (2.8) |  |  | — |
Net income available to common shareholders | $ | 62.0 |  |  | $ | 2.6 |  |  | $ | 137.9 |  |  | $ | 78.4 |
Weighted-average shares outstanding - basic | 35.6 |  |  | 35.5 |  |  | 35.6 |  |  | 35.5 |
Basic earnings per share | $ | 1.74 |  |  | $ | 0.07 |  |  | $ | 3.88 |  |  | $ | 2.21 |
Diluted earnings per share: |  |  |  |  |  |  |
Net income | $ | 63.3 |  |  | $ | 2.6 |  |  | $ | 140.7 |  |  | $ | 78.4 |
Less: Net income allocated to participating securities | (1.3) |  |  | — |  |  | (2.8) |  |  | — |
Net income available to common shareholders | $ | 62.0 |  |  | $ | 2.6 |  |  | $ | 137.9 |  |  | $ | 78.4 |
Weighted-average shares outstanding - basic | 35.6 |  |  | 35.5 |  |  | 35.6 |  |  | 35.5 |
Effect of dilutive securities: |  |  |  |  |  |  |
Equity compensation plans | 0.1 |  |  | 0.5 |  |  | 0.1 |  |  | 0.5 |
Weighted-average shares outstanding - diluted | 35.7 |  |  | 36.0 |  |  | 35.7 |  |  | 36.0 |
Diluted earnings per share | $ | 1.74 |  |  | $ | 0.07 |  |  | $ | 3.87 |  |  | $ | 2.18 |

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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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