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Incentive Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |
Stock-based Compensation Awards | We issued the following stock-based awards under the 2014 Performance Incentive Plan (the "2014 PIP") during the six months ended June 30, 2018.
| Awards |  | Weighted-average grant-date fair value (per award)
Restricted stock (shares or units) | 1.8 |  |  | $ | 23.62 |
Performance-based stock (shares) | 2.9 |  |  | $ | 21.13 |
Restricted stock units (settled in cash) | 0.1 |  |  | $ | 23.63 |
Total stock-based compensation awards | 4.8 |  |  |  |

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