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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stock Options and Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Valuation Assumptions
The following table illustrates the assumptions used in estimating fair value in the years ended December 31, 2018, 2017 and 2016:
 
2018
 
2017
 
2016
Grant date fair value of stock options and SARs
$
14.78

 
$
10.07

 
$
8.61

Expected stock price volatility
25.69
%
 
27.63
%
 
26.88
%
Risk-free interest rate
2.62
%
 
2.11
%
 
1.45
%
Expected annual dividend yield
1.34
%
 
1.87
%
 
2.10
%
Expected life of options & SARs (years)
5.7

 
5.8

 
6.0
Schedule of stock option and SAR activity
The following table illustrates the stock option and SAR activity for the year ended December 31, 2018:
 
Number
of
Shares
(in 000’s)
 
Weighted-
Average
Exercise
Price
Outstanding at December 31, 2017
2,308

 
$
42.75

 
 
 
 
Granted
839

 
$
59.64

Forfeited
(123
)
 
$
44.59

Exercised
(173
)
 
$
42.20

 
 
 
 
Outstanding at December 31, 2018
2,851

 
$
47.67

Exercisable at December 31, 2018
797

 
$
43.23

Stock options & SARs expected to vest
2,053

 
$
49.40
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of RSU and PSU activity
The following table illustrates the RSU and PSU activity for the year ended December 31, 2018:  
 
Number
of
Shares
(in 000’s)
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2017
228

 
$
41.66

 
 
 
 
Granted
31

 
$
61.76

Vested
(66
)
 
$
45.81

Forfeited
(6
)
 
$
45.03

 
 
 
 
Outstanding at December 31, 2018
187

 
$
43.46