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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share (“EPS”) (shares in millions):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net income for basic and diluted EPS | $ | 361 |  |  | $ | 163 |  |  | $ | 313 |
Basic weighted average shares outstanding | 83.4 |  |  | 92.0 |  |  | 103.4 |
Options and non-vested stock | 1.4 |  |  | 1.3 |  |  | 1.6 |
Diluted weighted average shares outstanding | 84.8 |  |  | 93.3 |  |  | 105.0 |
Earnings per share: |  |  |  |  |
| Basic | $ | 4.32 |  |  | $ | 1.78 |  |  | $ | 3.02 |
| Diluted | $ | 4.25 |  |  | $ | 1.75 |  |  | $ | 2.98 |
Outstanding Common Stock Equivalents That Were Anti-Dilutive | The following table summarizes the Company’s outstanding common stock equivalents that were anti-dilutive and therefore excluded from the computation of diluted EPS (shares in millions):
| As of December 31,
| 2017 |  | 2016 |  | 2015
Non-vested stock (a) | 0.5 |  |  | 0.2 |  |  | 0.1 |
__________
(a) | The weighted average grant date fair value for anti-dilutive non-vested stock for 2017, 2016 and 2015 was $38.40, $52.07 and $61.15, respectively.

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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://www.xbrl.org/2003/role/presentationRef -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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- 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://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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