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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation | A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
| Three Months Ended |  |  |  | Six Months Ended |  |
| June 30, 2020 |  | June 30, 2019 |  | June 30, 2020 |  | June 30, 2019
Numerator (basic and diluted): |  |  |  |  |  |  |
Net income | $ | 21.5 |  |  | $ | 20.5 |  |  | $ | 44.0 |  |  | $ | 37.9 |
Less: Dividends paid to participating securities | (0.2) |  |  | (0.1) |  |  | (0.4) |  |  | (0.2) |
Less: Undistributed earnings available to participating securities | (0.1) |  |  | (0.1) |  |  | (0.2) |  |  | (0.1) |
Undistributed and distributed earnings available to common stockholders | $ | 21.2 |  |  | $ | 20.3 |  |  | $ | 43.4 |  |  | $ | 37.6 |
Denominator: |  |  |  |  |  |  |
Average number of common shares outstanding | 30,792.6 |  |  | 30,661.4 |  |  | 30,752.5 |  |  | 30,641.1 |
Effect of dilutive stock-based compensation | 214.1 |  |  | 147.9 |  |  | 205.9 |  |  | 149.9 |
Average number of common and potential common shares outstanding | 31,006.7 |  |  | 30,809.3 |  |  | 30,958.4 |  |  | 30,791.0 |

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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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