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Basis of Presentation and Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2017
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):
 
 
2017
 
2016
 
2015
Net income
 
$
825.7

 
$
729.7

 
$
827.6

Less: Allocation to participating securities
 
(0.9
)
 
(0.7
)
 
(0.7
)
Net income available to common shareowners
 
$
824.8

 
$
729.0

 
$
826.9

Basic weighted average outstanding shares
 
128.4

 
130.2

 
134.5

Effect of dilutive securities
 
 
 
 
 
 
Stock options
 
1.2

 
0.9

 
1.1

Performance shares
 
0.3

 
—

 
0.1

Diluted weighted average outstanding shares
 
129.9

 
131.1

 
135.7

Earnings per share:
 
 
 
 
 
 
Basic
 
$
6.42

 
$
5.60

 
$
6.15

Diluted
 
$
6.35

 
$
5.56

 
$
6.09