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Basis of Presentation and Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2017
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
June 30,
 
Nine Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Net income
$
216.9

 
$
191.0

 
$
621.1

 
$
544.5

Less: Allocation to participating securities
(0.3
)
 
(0.2
)
 
(0.7
)
 
(0.6
)
Net income available to common shareowners
$
216.6

 
$
190.8


$
620.4

 
$
543.9

Basic weighted average outstanding shares
128.4

 
129.8

 
128.5

 
130.7

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.2

 
0.9

 
1.2

 
0.9

Performance shares
0.3

 
0.1

 
0.3

 
—

Diluted weighted average outstanding shares
129.9

 
130.8

 
130.0

 
131.6

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.69

 
$
1.47

 
$
4.83

 
$
4.16

Diluted
$
1.67

 
$
1.46

 
$
4.77

 
$
4.13