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Share-Based Payments (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Stock Options
The fair values of the options granted during the years ended December 31, 2018, 2017, and 2016 have been estimated at the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:
 
For the Year Ended December 31,
 
2018
 
2017
 
2016
Expected volatility
29.2
%
 
30.5
%
 
37.2
%
Risk-free interest rate
2.7
%
 
2.1
%
 
1.6
%
Expected life (years)
7.1

 
7.7

 
7.5

Dividend yield
2.2
%
 
2.2
%
 
2.1
%
The fair value of the SARs granted in conjunction with the EHHI acquisition has been estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
 
As of December 31,
 
2018
 
2017
Expected volatility
27.1
%
 
28.7
%
Risk-free interest rate
2.6
%
 
1.9
%
Expected life (years)
1.3

 
2.1

Dividend yield
—
%
 
—
%
Schedule of Stock Option Activity
A summary of our stock option activity and related information is as follows:
 
Shares
(In Thousands)
 
Weighted- Average Exercise Price per Share
 
Weighted- Average Remaining Life (Years)
 
Aggregate Intrinsic Value
(In Millions)
Outstanding, December 31, 2017
557

 
$
30.53

 
 
 
 
Granted
95

 
53.79

 
 
 
 
Exercised
(115
)
 
27.79

 
 
 
 
Forfeitures
—

 
—

 
 
 
 
Expirations
—

 
—

 
 
 
 
Outstanding, December 31, 2018
537

 
35.22

 
5.9
 
$
14.2

Exercisable, December 31, 2018
317

 
27.65

 
4.1
 
10.8
Schedule of Restricted Stock Activity
A summary of our issued restricted stock awards is as follows (share information in thousands):
 
Shares
 
Weighted-Average Grant Date Fair Value
Nonvested shares at December 31, 2017
673

 
$
40.90

Granted
687

 
37.61

Vested
(439
)
 
42.60

Forfeited
(14
)
 
40.00

Nonvested shares at December 31, 2018
907

 
37.61