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Basis of Presentation and Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 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
March 31,
 
Six Months Ended
March 31,
 
2015
 
2014
 
2015
 
2014
Net income
$
206.0

 
$
180.3

 
$
420.2

 
$
378.4

Less: Allocation to participating securities
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.5
)
Net income available to common shareowners
$
205.8

 
$
180.1


$
419.8

 
$
377.9

Basic weighted average outstanding shares
134.9

 
138.5

 
135.3

 
138.5

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.1

 
1.5

 
1.1

 
1.5

Performance shares
—

 
0.2

 
0.1

 
0.2

Diluted weighted average outstanding shares
136.0

 
140.2

 
136.5

 
140.2

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.53

 
$
1.30

 
$
3.10

 
$
2.73

Diluted
$
1.51

 
$
1.28

 
$
3.08

 
$
2.70