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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) available to common stockholders |  | $ | 22.4 |  |  | $ | (39.7 | ) |  | $ | 45.8 |  |  | $ | (6.6 | )
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 24,628 |  |  |  | 24,564 |  |  |  | 24,615 |  |  |  | 24,547 |
Dilutive effect of stock options and awards |  |  | 241 |  |  |  | 0 |  |  |  | 241 |  |  |  | 0 |
Denominator for diluted earnings per share |  |  | 24,869 |  |  |  | 24,564 |  |  |  | 24,856 |  |  |  | 24,547 |
Net income/(loss) per share, basic: |  | $ | 0.91 |  |  | $ | (1.62 | ) |  | $ | 1.86 |  |  | $ | (0.27 | )
Net income/(loss) per share, diluted: |  | $ | 0.90 |  |  | $ | (1.62 | ) |  | $ | 1.84 |  |  | $ | (0.27 | )

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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=6371337&loc=d3e3550-109257 + Details
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