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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016
Numerator (basic and diluted): |  |  |  |  |  |  |  |
Net income | $ | 22.3 |  |  | $ | 26.0 |  |  | $ | 36.0 |  |  | $ | 47.1 |
Less: Dividends paid to participating securities | (0.1 | ) |  | — |  |  | (0.2 | ) |  | (0.1 | )
Less: Undistributed earnings available to participating securities | (0.1 | ) |  | (0.2 | ) |  | (0.1 | ) |  | (0.2 | )
Undistributed and distributed earnings available to common stockholders | $ | 22.1 |  |  | $ | 25.8 |  |  | $ | 35.7 |  |  | $ | 46.8 |
Denominator: |  |  |  |  |  |  |  |  |
Average number of common shares outstanding | 30,412.9 |  |  | 30,313.2 |  |  | 30,389.0 |  |  | 30,304.1 |
Effect of dilutive stock-based compensation | 133.8 |  |  | 134.5 |  |  | 128.1 |  |  | 131.1 |
Average number of common and potential common shares outstanding | 30,546.7 |  |  | 30,447.7 |  |  | 30,517.1 |  |  | 30,435.2 |

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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/2003/role/presentationRef -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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