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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 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:
 
March 31,
2015
Stock price volatility
31.3
%
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
 
March 31, 2015
Fair value per performance share award
 
$
19.29

 
$10.37 - $14.21

Assumptions:
 
 

 
 

     Stock price volatility
 
32.3
%
 
29.3% - 30.3%

     Risk free rate of return
 
1.0
%
 
0.2% - 0.8%

     Expected dividend yield
 
0.3
%
 
0.3
%