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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule of Computations of Weighted Average Shares Outstanding | The computations of the weighted average shares outstanding for the years ended December 31, are as follows (in millions):
| 2019 |  | 2018 |  | 2017
Weighted-average shares outstanding | 423.2 |  |  | 473.3 |  |  | 485.7 |
Share-based payment awards classified as participating securities | 0.1 |  |  | 0.4 |  |  | 1.0 |
Basic weighted-average shares outstanding | 423.3 |  |  | 473.7 |  |  | 486.7 |
Dilutive securities (1) | 0.6 |  |  | — |  |  | 1.3 |
Diluted weighted-average shares outstanding | 423.9 |  |  | 473.7 |  |  | 488.0 |
(1) For 2018, 0.6 million potentially dilutive share-based awards are excluded as their effect would be anti-dilutive. For 2017, the amount of potentially dilutive securities that are excluded because their effect would be anti-dilutive are not material.

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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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