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Share-Based Compensation (Tables)
 6 Months Ended
Mar. 31, 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
 
Six Months Ended
 
 
31 March
 
31 March
 
 
2018
 
2017
 
2018
 
2017
Before-tax share-based compensation cost
 

$10.7

 

$9.5

 

$22.5

 

$18.5

Income tax benefit
 
(2.1
)
 
(3.3
)
 
(5.3
)
 
(6.3
)
After-tax share-based compensation cost
 

$8.6

 

$6.2

 

$17.2

 

$12.2
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
 
18.7
%
Risk-free interest rate
 
1.9
%
Expected dividend yield
 
2.6
%