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Basis of Presentation and Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Net income
$
206.1

 
$
199.7

 
$
626.3

 
$
578.1

Less: Allocation to participating securities
(0.3
)
 
(0.3
)
 
(0.5
)
 
(0.8
)
Net income available to common shareowners
$
205.8

 
$
199.4


$
625.8

 
$
577.3

Basic weighted average outstanding shares
134.3

 
138.0

 
134.9

 
138.3

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.1

 
1.4

 
1.1

 
1.5

Performance shares
0.1

 
0.2

 
0.1

 
0.2

Diluted weighted average outstanding shares
135.5

 
139.6

 
136.1

 
140.0

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.53

 
$
1.44

 
$
4.64

 
$
4.17

Diluted
$
1.52

 
$
1.43

 
$
4.60

 
$
4.12