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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 85.0 |  |  | $ | 61.8 |  |  | $ | 81.3 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 24,401 |  |  |  | 24,148 |  |  |  | 23,998 |
Dilutive effect of stock options and awards |  |  | 202 |  |  |  | 338 |  |  |  | 444 |
Denominator for diluted earnings per share |  |  | 24,603 |  |  |  | 24,486 |  |  |  | 24,442 |
Net income per share, basic: |  | $ | 3.48 |  |  | $ | 2.56 |  |  | $ | 3.39 |
Net income per share, diluted: |  | $ | 3.45 |  |  | $ | 2.52 |  |  | $ | 3.33 |

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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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