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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares | Our weighted-average shares outstanding for the three and six months ended June 30, 2019 and 2018 was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Weighted-average number of shares of common stock outstanding - basic | 101.3 |  |  | 106.1 |  |  | 101.8 |  |  | 106.4 |
Stock options | 0.3 |  |  | 1.1 |  |  | 0.4 |  |  | 1.2 |
Restricted stock units | 0.6 |  |  | 0.8 |  |  | 1.1 |  |  | 1.4 |
Weighted-average shares and assumed conversions - diluted | 102.2 |  |  | 108.0 |  |  | 103.3 |  |  | 109.0 |

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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://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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