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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computations of basic and diluted loss per share for loss from continuing operations | The computations of basic and diluted earnings per share for Income from continuing operations were as follows (in millions, except per share data):
| For the Three Months Ended March 31,
| 2018 |  | 2017
Net income | $ | 37.9 |  |  | $ | 43.5 |
Add: Loss from discontinued operations | — |  |  | — |
Income from continuing operations | $ | 37.9 |  |  | $ | 43.5 |
Weighted-average shares outstanding – basic | 41.5 |  |  | 42.8 |
Add: Potential effect of dilutive securities attributable to stock-based payments | 0.6 |  |  | 0.7 |
Weighted-average shares outstanding – diluted | 42.1 |  |  | 43.5 |
Earnings per share – Basic: |  |  |
Income from continuing operations | $ | 0.91 |  |  | $ | 1.02 |
Loss from discontinued operations | — |  |  | — |
Net income | $ | 0.91 |  |  | $ | 1.02 |
Earnings per share – Diluted: |  |  |
Income from continuing operations | $ | 0.90 |  |  | $ | 1.00 |
Loss from discontinued operations | — |  |  | — |
Net income | $ | 0.90 |  |  | $ | 1.00 |
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation | The following stock appreciation rights and restricted stock units were outstanding but not included in the diluted earnings per share calculation because the assumed exercise of such rights would have been anti-dilutive (in millions, except for per share data):
| For the Three Months Ended March 31,
| 2018 |  | 2017
Weighted-average number of shares | 0.2 |  |  | 0.2 |
Price per share | $ | 205.53 |  |  | $ | 156.94 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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