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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Valuation Assumptions
The following weighted-average assumptions were utilized in calculating the fair value of options granted during the periods indicated:
 
 
Year Ended December 31, 2015
Risk-free interest rate
 
1.8%
Dividend yield
 
5.2%
Historical volatility factor
 
0.24
Weighted-average expected life
 
7 years
Schedule of Stock Options Activity
A summary of the Company's share option activity and related information for the year ended December 31, 2017 follows:
 
 
Options (000s)
 
Weighted Average Exercise Price
Outstanding January 1, 2017
 
1,927

 
$
36.02

Exercised
 
(193
)
 
34.72

Forfeited
 
(153
)
 
48.58

Outstanding December 31, 2017
 
1,581

 
$
34.97

Exercisable at December 31, 2017
 
1,417

 
$
34.95
Schedule of Key Assumptions Used in the Monte Carlo Simulation
The key assumptions used in the Monte Carlo simulations are as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Risk-free interest rate
1.43%
 
1.01%
 
0.99%
Volatility
20%
 
19%
 
17%
Schedule of Nonvested Share Activity
The Company's restricted LTI share activity for the year ended December 31, 2017 is as follows:
 
 
Shares (000s)
 
Weighted Avg. Grant Date Fair value
Nonvested at January 1, 2017
 
812

 
$
34.71

Granted
 
310

 
39.93

Vested
 
(330
)
 
35.57

Forfeited
 
(17
)
 
35.07

Nonvested at December 31, 2017
 
775

 
$
36.43