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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Computations of Weighted Average Shares Outstanding | The computations of the weighted average shares outstanding for the periods indicated are as follows (in millions):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted-average shares outstanding |  |  | 485.8 |  |  |  | 483.3 |  |  |  | 485.6 |  |  |  | 483.0 |
Share-based payment awards classified as participating securities (1) |  |  | 0.4 |  |  |  | 1.0 |  |  |  | 0.5 |  |  |  | 1.2 |
Basic weighted-average shares outstanding |  |  | 486.2 |  |  |  | 484.3 |  |  |  | 486.1 |  |  |  | 484.2 |
Dilutive securities (2) |  |  | — |  |  |  | 1.6 |  |  |  | — |  |  |  | 1.6 |
Diluted weighted-average shares outstanding |  |  | 486.2 |  |  |  | 485.9 |  |  |  | 486.1 |  |  |  | 485.8 |
(1) | For the three months ended June 30, 2018 and 2017 dividends and equivalents for share-based awards that are expected to be forfeited do not have a material effect on net income for basic and diluted earnings per share.
(2) | The three and six months ended June 30, 2018 excludes 0.8 million and 0.9 million potentially dilutive share-based awards as their effect would be anti-dilutive.

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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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