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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Supplemental Employee Incentive Plan IV |
Stock-Based Compensation arrangements |
Schedule of Value per Share and Assumptions Used | The following assumptions were used to determine the period-end fair value of the Supplemental Employee Incentive Plan IV liability using a Monte Carlo simulation model:
| June 30, 2015
Stock price volatility | 30.3 | %
Risk free rate of return | 0.7 | %
Annual salary increase rate | 4.0 | %
Annual turnover rate | 4.6 | %
TSR Performance Share Awards |
Stock-Based Compensation arrangements |
Schedule of Value per Share and Assumptions Used | The following assumptions were used to determine the grant date fair value of the equity component (February 19, 2015) and the period-end fair value of the liability component of the TSR Performance Share Awards:
|  | Grant Date |  | June 30, 2015
Fair value per performance share award |  | $ | 19.29 |  |  | $14.60 - $19.30 |
Assumptions: |  |  |  |  |  |
Stock price volatility |  | 32.3 | % |  | 25.6% - 29.0% |
Risk free rate of return |  | 1.0 | % |  | 0.1% - 0.8% |
Expected dividend yield |  | 0.3 | % |  | 0.3 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of share-based compensation. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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