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Share-Based Compensation (Tables)
3 Months Ended
Dec. 31, 2017
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
 
 
31 December
 
 
2017
 
2016
Before-tax share-based compensation cost
 
$
11.8

 
$
9.0

Income tax benefit
 
(3.2
)
 
(3.0
)
After-tax share-based compensation cost
 
$
8.6

 
$
6.0

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
%