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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Reconcilliation of Basic to Diluted Net Income Per Share | The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:
(in millions) | 2017 |  | 2016 |  | 2015
Net income | $ | 150.7 |  |  | $ | 143.6 |  |  | $ | 95.6 |
Weighted average common shares outstanding | 73.9 |  |  | 73.3 |  |  | 72.0 |
Dilutive effect of equity awards, based on the treasury stock method | 1.9 |  |  | 1.7 |  |  | 1.8 |
Weighted average shares assuming dilution | 75.8 |  |  | 75.0 |  |  | 73.8 |

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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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