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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table presents a summary of stock option activity:
  
 
Number of Options
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value (in millions)
Outstanding December 31, 2017
 
2,309,769

 
$
75.17

 
 
Granted
 
164,889

 
$
150.87

 
 
Exercised
 
(286,874
)
 
$
59.45

 
 
Forfeited
 
(17,341
)
 
$
119.63

 
 
Outstanding December 31, 2018
 
2,170,443

 
$
82.65

 
$
126.7

Options exercisable
 
1,633,182

 
$
73.09

 
$
110.1
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number Outstanding as
of 12/31/2018
 
Weighted-Average
Remaining
Contractual Life (years)
 
Weighted-
Average Exercise
Price
 
Number
Exercisable as of
12/31/2018
 
Weighted-Average
Exercise Price
  $0.00 - $49.99
 
163,805

 
0.9
 
$
43.97

 
163,805

 
$
43.97

$50.00 - $59.99
 
775,518

 
3.5
 
$
58.26

 
775,518

 
$
58.26

$60.00 - $69.99
 
839

 
4.2
 
$
60.24

 
839

 
$
60.24

$70.00 - $79.99
 
159,593

 
5.2
 
$
78.48

 
159,593

 
$
78.48

$90.00 +
 
1,070,688

 
7.4
 
$
106.87

 
533,427

 
$
102.00

Totals
 
2,170,443

 
5.3
 
$
82.65

 
1,633,182

 
$
73.09
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table presents the weighted average assumptions used to determine the fair value of stock options issued:
For the years ended December 31,
 
2018
 
2017
 
2016
Dividend yield
 
1.33
%
 
1.26
%
 
1.58
%
Risk-free rate of return
 
2.79
%
 
2.32
%
 
1.69
%
Expected volatility
 
21.4
%
 
22.8
%
 
28.1
%
Expected life (years)
 
7.0

 
7.0

 
7.0

Weighted average exercise price of stock options granted
 
$
150.87

 
$
129.72

 
$
93.53

Weighted average fair value of stock options granted
 
$
36.31

 
$
31.57

 
$
24.52
Share-based Compensation, Activity [Table Text Block]
The following table presents a summary of Performance Share and Restricted Stock Unit activity:
  
Performance Contingent Units    
 
Restricted Stock Units
Outstanding December 31, 2017
463,259

 
77,358

Granted
110,042

 
20,393

Paid
(170,080
)
 
(28,023
)
Forfeited
(7,350
)
 
(2,729
)
Outstanding December 31, 2018
395,871

 
66,999