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Share-Based Compensation (Tables)
 3 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation cost recognized in continuing operations on the consolidated income statements is summarized below:
 
 
Three Months Ended
 
 
31 December
 
 
2016
 
2015
Before-Tax Share-Based Compensation Cost
 
$
9.0

 
$
8.3

Income Tax Benefit
 
(3.0
)
 
(2.8
)
After-Tax Share-Based Compensation Cost
 
$
6.0

 
$
5.5
Schedule of Share-based Payment Award, Market-Based Deferred Stock Units, Valuation Assumptions
The calculation of the fair value of market-based deferred stock units used the following assumptions:
Expected volatility
 
20.6
%
Risk-free interest rate
 
1.4
%
Expected dividend yield
 
2.5
%