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Basis of Presentation and Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]  
Reconciled Basic and Diluted EPS
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,
 
2014
 
2013
 
2014
 
2013
Net income
$
180.3

 
$
175.9

 
$
378.4

 
$
337.3

Less: Allocation to participating securities
(0.2
)
 
(0.3
)
 
(0.5
)
 
(0.5
)
Net income available to common shareowners
$
180.1

 
$
175.6

 
$
377.9

 
$
336.8

Basic weighted average outstanding shares
138.5

 
140.0

 
138.5

 
139.6

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.5

 
1.6

 
1.5

 
1.6

Performance shares
0.2

 
0.2

 
0.2

 
0.2

Diluted weighted average outstanding shares
140.2

 
141.8

 
140.2

 
141.4

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.30

 
$
1.25

 
$
2.73

 
$
2.41

Diluted
$
1.28

 
$
1.24

 
$
2.70

 
$
2.38