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STOCK COMPENSATION PLANS (Tables) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Disclosure of Share Based Compensation Arrangements by Share Based Payment Awards
Changes in options outstanding under the plans for the period indicated were as follows:
 
Number of
Options
 
Weighted-Average
Exercise Price
per Option
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2018
0.8

 
100.30

 
 
 
 
Granted
0.2

 
163.80

 
 
 
 
Exercised
(0.3
)
 
85.74

 
 
 
 
Cancelled
(0.1
)
 
151.21

 
 
 
 
Outstanding at December 31, 2019
0.6

 
125.26

 
5.4
 
$
27.3

Vested and expected to vest at December 31, 2019
0.6

 
125.26

 
2.9
 
$
24.5

Exercisable at December 31, 2019
0.4

 
99.86

 
2.9
 
$
24.5


  
Disclosure of the Impact of Stock Options Exercised
Cash received by the Company from option exercises, the actual tax benefit realized for the tax deductions and the aggregate intrinsic value of options exercised from option exercises under all share-based payment arrangements during the years ended December 31, 2019, 2018, and 2017 were as follows:
 
2019
 
2018
 
2017
Cash received by the Company
$
27.6

 
$
37.5

 
$
43.9

Tax benefits realized
$
6.9

 
$
9.4

 
$
13.4

Aggregate intrinsic value
$
24.5

 
$
44.1

 
$
34.8


  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company uses the Black-Scholes model to calculate the fair value of the employee’s purchase right. The fair value of the employee’s purchase right and the assumptions used in its calculation are as follows:
 
2019
 
2018
 
2017
Fair value of the employee’s purchase right
$
31.84

 
$
34.43

 
$
31.54

Valuation assumptions
 

 
 

 
 

Risk free interest rate
1.9
%
 
2.3
%
 
1.3
%
Expected volatility
0.2

 
0.2

 
0.2

Expected dividend yield
—

 
—

 
—


The following table shows the weighted average grant-date fair values of options issued during the respective year and the weighted average assumptions that the Company used to develop the fair value estimates:
 
2019 Grant Dates
 
 
 
November 1
November 1
February 12
 
2018
Fair value per option
$
39.85

$30.39
$
34.40

 
$
44.37

Valuation assumptions
 
 
 
 
 
Weighted average expected life (in years)
6.0

6.0

6.0

 
6.0

Risk free interest rate
1.6
%
1.6
%
2.5
%
 
2.7
%
Expected volatility
20.8
%
20.8
%
20.0
%
 
18.9
%
Expected dividend yield
N/A

N/A

N/A

 
N/A


  
Schedule of Nonvested Share Activity
The following table shows a summary of non-vested shares for the year ended December 31, 2019:
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Non-vested at January 1, 2019
1.3

 
$
140.58

Granted
0.9

 
150.29

Vested
(0.8
)
 
120.22

Canceled
(0.1
)
 
153.10

Non-vested at December 31, 2019
1.3

 
$
152.70


  
Award vesting period (in years) 3 years 3 years
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range01 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range, lower range limit   $ 60.04
Exercise price range, upper range limit   84.86
Exercise Price Range 2 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range, lower range limit   84.87
Exercise price range, upper range limit   90.74
Exercise Price Range 3 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range, lower range limit   90.75
Exercise price range, upper range limit   130.60
Exercise Price Range 4 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price range, lower range limit   130.61
Exercise price range, upper range limit   $ 166.53