Share-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2019

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
	2019			2018			2019			2018
Before-tax share-based compensation cost		$9.8			$7.9			$31.0			$30.4
Income tax benefit	(2.3		)	(1.9		)	(7.3		)	(7.2		)
After-tax share-based compensation cost		$7.5			$6.0			$23.7			$23.2

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	17.5	%
Risk-free interest rate	2.8	%
Expected dividend yield	2.6	%