Share-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Recognized Share-Based Compensation Cost

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

	Three Months Ended		Nine Months Ended
	30 June		30 June
	2021	2020	2021	2020
Before-tax share-based compensation cost	$12.2	$12.5	$34.6	$41.4
Income tax benefit	(3.2)	(3.0)	(8.6)	(9.8)
After-tax share-based compensation cost	$9.0	$9.5	$26.0	$31.6

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

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

Expected volatility	29.9	%
Risk-free interest rate	0.2	%
Expected dividend yield	2.1	%