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Basis of Presentation and Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
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):
 
 
2018
 
2017
 
2016
Net income
 
$
535.5

 
$
825.7

 
$
729.7

Less: Allocation to participating securities
 
(0.5
)
 
(0.9
)
 
(0.7
)
Net income available to common shareowners
 
$
535.0

 
$
824.8

 
$
729.0

Basic weighted average outstanding shares
 
125.4

 
128.4

 
130.2

Effect of dilutive securities
 
 
 
 
 
 
Stock options
 
1.3

 
1.2

 
0.9

Performance shares
 
0.2

 
0.3

 
—

Diluted weighted average outstanding shares
 
126.9

 
129.9

 
131.1

Earnings per share:
 
 
 
 
 
 
Basic
 
$
4.27

 
$
6.42

 
$
5.60

Diluted
 
$
4.21

 
$
6.35

 
$
5.56