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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Weighted Average Shares Outstanding | The effects of potential common stock were determined using the treasury stock method. Weighted average shares outstanding are shown below:
| Three months ended September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Basic shares outstanding | 103.4 |  |  | 102.3 |  |  | 103.2 |  |  | 102.1 |
Effect of potential common stock: |  |  |  |  |  |  |
Common stock awards | 1.2 |  |  | 1.4 |  |  | 1.2 |  |  | 1.3 |
Diluted shares outstanding | 104.6 |  |  | 103.7 |  |  | 104.4 |  |  | 103.4 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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