Share-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2023

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
	2023	2022	2023	2022
Before-tax share-based compensation cost	$14.5	$10.7	$46.9	$38.0
Income tax benefit	(3.5)	(2.6)	(11.4)	(9.3)
After-tax share-based compensation cost	$11.0	$8.1	$35.5	$28.7

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	32.5	%
Risk-free interest rate	4.0	%
Expected dividend yield	2.4	%