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Basis of Presentation and Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles basic and diluted EPS amounts (in millions, except per share amounts):
 
 
2015
 
2014
 
2013
Net income
 
$
827.6

 
$
826.8

 
$
756.3

Less: Allocation to participating securities
 
(0.7
)
 
(1.1
)
 
(1.1
)
Net income available to common shareowners
 
$
826.9

 
$
825.7

 
$
755.2

Basic weighted average outstanding shares
 
134.5

 
138.0

 
139.2

Effect of dilutive securities
 
 
 
 
 
 
Stock options
 
1.1

 
1.5

 
1.5

Performance shares
 
0.1

 
0.2

 
0.2

Diluted weighted average outstanding shares
 
135.7

 
139.7

 
140.9

Earnings per share:
 
 
 
 
 
 
Basic
 
$
6.15

 
$
5.98

 
$
5.43

Diluted
 
$
6.09

 
$
5.91

 
$
5.36