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Basis of Presentation and Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 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
March 31,
 
Six Months Ended
March 31,
 
2016
 
2015
 
2016
 
2015
Net income
$
168.0

 
$
206.0

 
$
353.5

 
$
420.2

Less: Allocation to participating securities
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Net income available to common shareowners
$
167.8

 
$
205.8


$
353.1

 
$
419.8

Basic weighted average outstanding shares
130.5

 
134.9

 
131.2

 
135.3

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
0.8

 
1.1

 
0.8

 
1.1

Performance shares
—

 
—

 
—

 
0.1

Diluted weighted average outstanding shares
131.3

 
136.0

 
132.0

 
136.5

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.29

 
$
1.53

 
$
2.69

 
$
3.10

Diluted
$
1.28

 
$
1.51

 
$
2.68

 
$
3.08