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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
  
 
Number of Options
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value (in millions)
Outstanding December 31, 2016
 
2,573,223

 
$
68.70

 
 
Granted
 
171,388

 
$
129.72

 
 
Exercised
 
(430,429
)
 
$
58.07

 
 
Forfeited
 
(4,413
)
 
$
87.15

 
 
Outstanding December 31, 2017
 
2,309,769

 
$
75.17

 
$
186.5

Options exercisable
 
1,700,629

 
$
66.04

 
$
152.9
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 12/31/2017
 
Weighted-Average
Remaining
Contractual Life (years)
 
Weighted-
Average Exercise
Price
 
Number
Exercisable as of
12/31/2017
 
Weighted-Average
Exercise Price
  $0.00 - $49.99
 
245,264

 
1.7
 
$
40.54

 
245,264

 
$
40.54

$50.00 - $59.99
 
902,246

 
4.4
 
$
58.23

 
902,246

 
$
58.23

$60.00 - $69.99
 
839

 
5.2
 
$
60.24

 
839

 
$
60.24

$70.00 - $79.99
 
190,137

 
6.2
 
$
78.48

 
190,137

 
$
78.48

$90.00 +
 
971,283

 
8.1
 
$
99.02

 
362,143

 
$
96.22

Totals
 
2,309,769

 
5.8
 
$
75.17

 
1,700,629

 
$
66.04
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,
 
2017
 
2016
 
2015
Dividend yield
 
1.26
%
 
1.58
%
 
1.47
%
Risk-free rate of return
 
2.32
%
 
1.69
%
 
2.04
%
Expected volatility
 
22.8
%
 
28.1
%
 
35.0
%
Expected life (years)
 
7.0

 
7.0

 
7.0

Weighted average exercise price of stock options granted
 
$
129.72

 
$
93.53

 
$
91.65

Weighted average fair value of stock options granted
 
$
31.57

 
$
24.52

 
$
30.50
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, 2016
585,971

 
96,628

Granted
115,176

 
22,971

Paid
(137,083
)
 
(38,843
)
Forfeited
(100,805
)
 
(3,398
)
Outstanding December 31, 2017
463,259

 
77,358