Stock Compensation Plans - (Tables)

12 Months Ended

Jan. 31, 2020

Share-based Payment Arrangement [Abstract]

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

	Years Ended January 31,
	2020		2019		2018
Dividend yield	2.2	%	2.2	%	1.8	%
Expected volatility	24.6	%	24.2	%	22.0	%
Risk-free interest rate	2.1	%	2.5	%	2.2	%
Expected term in years	4		4		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, 2019	2.4		$	89.84	8.33	$	11.3
Granted	0.1		94.68
Exercised	(1.3	)	88.40
Forfeited/canceled	—		97.13
Outstanding at January 31, 2020	1.2		$	91.53	7.64	$	52.8
Exercisable at January 31, 2020	0.4		$	88.09	6.27	$	18.4

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, 2019	0.6		$	88.49
Granted	0.5		117.12
Vested	(0.3	)	86.84
Forfeited	(0.1	)	94.86
Non-vested at January 31, 2020	0.7		$	108.28

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, 2019	0.5		$	85.30
Granted	0.1		134.12
Vested	(0.1	)	63.05
Forfeited/canceled	—		57.08
Non-vested at January 31, 2020	0.5		$	102.46