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Share-Based Compensation (Tables)
 3 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Recognized Share-Based Compensation Cost Share-based compensation cost recognized on the consolidated income statements is summarized below:
 
 
Three Months Ended
 
 
31 December
 
 
2018
 
2017
Before-tax share-based compensation cost
 

$9.3

 

$11.8

Income tax benefit
 
(2.2
)
 
(3.2
)
After-tax share-based compensation cost
 

$7.1

 

$8.6
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
%