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Basis of Presentation and Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles basic and diluted earnings per share (EPS) amounts (in millions, except per share amounts):
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Net income
$
191.0

 
$
206.1

 
$
544.5

 
$
626.3

Less: Allocation to participating securities
(0.2
)
 
(0.3
)
 
(0.6
)
 
(0.5
)
Net income available to common shareowners
$
190.8

 
$
205.8


$
543.9

 
$
625.8

Basic weighted average outstanding shares
129.8

 
134.3

 
130.7

 
134.9

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
0.9

 
1.1

 
0.9

 
1.1

Performance shares
0.1

 
0.1

 
—

 
0.1

Diluted weighted average outstanding shares
130.8

 
135.5

 
131.6

 
136.1

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.47

 
$
1.53

 
$
4.16

 
$
4.64

Diluted
$
1.46

 
$
1.52

 
$
4.13

 
$
4.60