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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair values of our stock options are calculated using the following weighted average assumptions for the nine months ended September 30, 2015:
 
 
Nine Months Ended
Assumptions
 
September 30, 2015
Dividend yield
 
1.8
%
Expected volatility
 
23.3
%
Risk-free interest rate
 
1.3
%
Expected holding period (in years)
 
4.0
Schedule of Share-based Compensation, Stock Options, Activity
The following table sets forth stock option activity for the nine months ended September 30, 2015:
 
Options
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2014
12,107,106

 
$
11.63

Granted
2,036,010

 
$
23.00

Exercised
(2,945,438
)
 
$
10.44

Canceled
(21,400
)
 
$
20.59

Outstanding at September 30, 2015
11,176,278

 
$
13.98

Exercisable at September 30, 2015
7,008,300

 
$
10.58
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Restricted share activity for the nine months ended September 30, 2015 was as follows:
 
Restricted
Shares
 
Weighted-Average
Grant-Date
Fair Value
Nonvested restricted shares at December 31, 2014
1,319,260

 
$
13.39

Granted
253,791

 
$
23.00

Forfeited
(3,840
)
 
$
20.47

Vested
(990,558
)
 
$
12.37

Nonvested restricted shares at September 30, 2015
578,653

 
$
19.32