Stock Compensation Plans (Tables)

12 Months Ended

Jan. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

	Years Ended January 31,
	2018		2017		2016
Dividend yield	1.8	%	2.0	%	1.9	%
Expected volatility	22.0	%	23.8	%	28.1	%
Risk-free interest rate	2.2	%	1.8	%	1.5	%
Expected term in years	5		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, 2017	2.3		$	70.72	7.50	$	23.8
Granted	0.7		100.25
Exercised	(0.8	)	65.72
Forfeited/canceled	(0.5	)	74.15
Outstanding at January 31, 2018	1.7		$	84.25	7.87	$	41.1
Exercisable at January 31, 2018	0.7		$	73.46	5.99	$	23.6

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

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, 2017	0.6		$	73.33
Granted	0.3		91.69
Vested	(0.2	)	92.95
Forfeited	(0.1	)	78.58
Non-vested at January 31, 2018	0.6		$	81.12

Schedule Of Share Based Compensation Performance Stock Units Award Activity Table

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, 2017	0.7		$	73.52
Granted	0.2		108.99
Vested	—		83.45
Forfeited/canceled	(0.4	)	72.49
Non-vested at January 31, 2018	0.5		$	84.85