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Share-Based Compensation (Tables)
 6 Months Ended
Mar. 31, 2017
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
 
Six Months Ended
 
 
31 March
 
31 March
 
 
2017
 
2016
 
2017
 
2016
Before-Tax Share-Based Compensation Cost
 
$
9.5

 
$
8.1

 
$
18.5

 
$
16.4

Income Tax Benefit
 
(3.3
)
 
(2.7
)
 
(6.3
)
 
(5.5
)
After-Tax Share-Based Compensation Cost
 
$
6.2

 
$
5.4

 
$
12.2

 
$
10.9
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
%