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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Antidilutive Securities Excluded From Earnings per Share | Anti-dilutive shares, which could potentially dilute earnings per share in the future, are set forth below (in millions):
| Three months ended March 31,
| 2019 |  | 2018
Share options and appreciation rights | 1.4 |  |  | 1.5 |
P-Units, RSAs and RSUs | 5.6 |  |  | 4.6 |
Total potentially dilutive shares | 7.0 |  |  | 6.1 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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