Share-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2020

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
	2020	2019	2020	2019
Before-tax share-based compensation cost	$12.5	$9.8	$41.4	$31.0
Income tax benefit	(3.0)	(2.3)	(9.8)	(7.3)
After-tax share-based compensation cost	$9.5	$7.5	$31.6	$23.7

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	17.8	%
Risk-free interest rate	1.6	%
Expected dividend yield	2.4	%