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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Numerator (basic and diluted): |  |  |  |  |  |  |  |
Net income | $ | 41.0 |  |  | $ | 25.8 |  |  | $ | 87.3 |  |  | $ | 61.8 |
Less: Dividends paid to participating securities | (0.1 | ) |  | (0.1 | ) |  | (0.2 | ) |  | (0.3 | )
Less: Undistributed earnings available to participating securities | (0.2 | ) |  | (0.1 | ) |  | (0.4 | ) |  | (0.2 | )
Undistributed and distributed earnings available to common stockholders | $ | 40.7 |  |  | $ | 25.6 |  |  | $ | 86.7 |  |  | $ | 61.3 |
Denominator: |  |  |  |  |  |  |  |  |
Average number of common shares outstanding | 30,569.6 |  |  | 30,422.8 |  |  | 30,541.6 |  |  | 30,400.4 |
Effect of dilutive stock-based compensation | 153.2 |  |  | 146.7 |  |  | 141.5 |  |  | 134.3 |
Average number of common and potential common shares outstanding | 30,722.8 |  |  | 30,569.5 |  |  | 30,683.1 |  |  | 30,534.7 |

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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://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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