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Stock Compensation Plans - (Tables)
 12 Months Ended
Jan. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
 
Years Ended January 31,
 
 
2019

2018

2017

Dividend yield
2.2
%
1.8
%
2.0
%
Expected volatility
24.2
%
22.0
%
23.8
%
Risk-free interest rate
2.5
%
2.2
%
1.8
%
Expected term in years
4

5

5
Schedule of Share-based Compensation, Activity
A summary of the Company's stock option activity is presented below:
 
Number of
 Shares
(in millions)

Weighted-
Average
Exercise Price

Weighted-
 Average
Remaining
Contractual
Term in Years
Aggregate
Intrinsic
Value
(in millions)

Outstanding at January 31, 2018
1.7

   $
84.25

7.87
     $
41.1

Granted
1.1

92.05

 
 
Exercised
(0.3
)
70.35

 
 
Forfeited/canceled
(0.1
)
76.46

 
 
Outstanding at January 31, 2019
2.4

   $
89.84

8.33
     $
11.3

Exercisable at January 31, 2019
0.7

   $
84.21

6.45
     $
7.0
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of the Company's PSU activity is presented below:
 
Number of Shares
(in millions)

Weighted-Average
Grant-Date Fair Value

Non-vested at January 31, 2018
0.5

                  $
84.85

Granted
0.2

85.26

Vested
(0.1
)
84.16

Forfeited/canceled
(0.1
)
83.46

Non-vested at January 31, 2019
0.5

                  $
85.30

A summary of the Company's RSU activity is presented below:
 
Number of Shares
(in millions)

Weighted-Average
Grant-Date Fair Value

Non-vested at January 31, 2018
0.6

                  $
81.12

Granted
0.3

103.40

Vested
(0.2
)
103.47

Forfeited
(0.1
)
88.57

Non-vested at January 31, 2019
0.6

                  $
88.49