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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019
Numerator (basic and diluted): |  |  |  |  |  |  |
Net income | $ | 24.5 |  |  | $ | 27.7 |  |  | $ | 68.5 |  |  | $ | 65.6 |
Less: Dividends paid to participating securities | (0.1) |  |  | — |  |  | (0.5) |  |  | (0.2) |
Less: Undistributed earnings available to participating securities | (0.2) |  |  | (0.1) |  |  | (0.4) |  |  | (0.2) |
Undistributed and distributed earnings available to common stockholders | $ | 24.2 |  |  | $ | 27.6 |  |  | $ | 67.6 |  |  | $ | 65.2 |
Denominator: |  |  |  |  |  |  |
Average number of common shares outstanding | 30,909.7 |  |  | 30,662.8 |  |  | 30,805.3 |  |  | 30,648.4 |
Effect of dilutive stock-based compensation | 232.8 |  |  | 169.1 |  |  | 214.8 |  |  | 156.3 |
Average number of common and potential common shares outstanding | 31,142.5 |  |  | 30,831.9 |  |  | 31,020.1 |  |  | 30,804.7 |

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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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