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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 30.1 |  |  | $ | 20.6 |  |  | $ | 81.1 |  |  | $ | 64.6 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 24,491 |  |  |  | 24,419 |  |  |  | 24,476 |  |  |  | 24,399 |
Dilutive effect of stock options and awards |  |  | 224 |  |  |  | 178 |  |  |  | 224 |  |  |  | 181 |
Denominator for diluted earnings per share |  |  | 24,715 |  |  |  | 24,597 |  |  |  | 24,700 |  |  |  | 24,580 |
Net income per share, basic: |  | $ | 1.23 |  |  | $ | 0.84 |  |  | $ | 3.31 |  |  | $ | 2.65 |
Net income per share, diluted: |  | $ | 1.22 |  |  | $ | 0.84 |  |  | $ | 3.28 |  |  | $ | 2.63 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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