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Share-Based Compensation (Tables)
 9 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Recognized Share-Based Compensation Cost Share-based compensation cost recognized in continuing operations on the consolidated income statements is summarized below:
 
 
Three Months Ended
 
Nine Months Ended
 
 
30 June
 
30 June
 
 
2018
 
2017
 
2018
 
2017
Before-tax share-based compensation cost
 

$7.9

 

$8.9

 

$30.4

 

$27.4

Income tax benefit
 
(1.9
)
 
(3.2
)
 
(7.2
)
 
(9.5
)
After-tax share-based compensation cost
 

$6.0

 

$5.7

 

$23.2

 

$17.9
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
 
18.7
%
Risk-free interest rate
 
1.9
%
Expected dividend yield
 
2.6
%