Share-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Recognized Share-Based Compensation Cost

Share-based compensation cost recognized in the consolidated income statements is summarized below:

	2020	2019	2018
Before-tax share-based compensation cost	$55.8	$41.2	$38.8
Income tax benefit	(13.0)	(9.7)	(9.1)
After-tax share-based compensation cost	$42.8	$31.5	$29.7

Schedule of Before-Tax Share-Based Compensation Costs by Type of Program

Before-tax share-based compensation cost by type of program was as follows:

	2020	2019	2018
Deferred stock units	$55.8	$41.1	$38.3
Stock options	—	—	0.2
Restricted stock	—	0.1	0.3
Before-tax share-based compensation cost	$55.8	$41.2	$38.8

Schedule of Assumptions for Fair Value of Market-Based Deferred Stock Units

The calculation of the fair value of these market-based deferred stock units used the following assumptions:

	2020		2019		2018
Expected volatility	17.8	%	17.5	%	18.7	%
Risk-free interest rate	1.6	%	2.8	%	1.9	%
Expected dividend yield	2.4	%	2.6	%	2.6	%

Schedule of Deferred Stock Units and Restricted Stock Activity

A summary of deferred stock unit activity in fiscal year 2020 is presented below:

	Shares (000)	Weighted Average Grant-Date Fair Value
Deferred stock units outstanding at 30 September 2019	976	$156.31
Granted	203	252.53
Paid out	(300)	141.08
Forfeited/adjustments	47	131.35
Deferred stock units outstanding at 30 September 2020	926	$181.14

A summary of restricted stock activity in fiscal year 2020 is presented below:

	Shares (000)	Weighted Average Grant-Date Fair Value
Restricted stock outstanding at 30 September 2019	26	$138.00
Vested	(26)	138.00
Restricted stock outstanding at 30 September 2020	—	$—

Schedule of Stock Option Activity

A summary of stock option activity in fiscal year 2020 is presented below:

	Shares (000)	Weighted Average Exercise Price
Stock options outstanding and exercisable at 30 September 2019	1,344	$93.75
Exercised	(403)	86.28
Forfeited	—	—
Stock options outstanding and exercisable at 30 September 2020	941	$96.95