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Share-Based Compensation (Tables)
6 Months Ended
Mar. 31, 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
 
Six Months Ended
 
 
31 March
 
31 March
 
 
2020
 
2019
 
2020
 
2019
Before-tax share-based compensation cost
 

$13.5

 

$11.9

 

$28.9

 

$21.2

Income tax benefit
 
(3.1
)
 
(2.8
)
 
(6.8
)
 
(5.0
)
After-tax share-based compensation cost
 

$10.4

 

$9.1

 

$22.1

 

$16.2


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