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Basis of Presentation and Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Net income
$
198.6

 
$
216.9

 
$
189.6

 
$
621.1

Less: Allocation to participating securities
(0.1
)
 
(0.3
)
 
(0.2
)
 
(0.7
)
Net income available to common shareowners
$
198.5

 
$
216.6


$
189.4

 
$
620.4

Basic weighted average outstanding shares
124.4

 
128.4

 
126.5

 
128.5

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.2

 
1.2

 
1.4

 
1.2

Performance shares
0.2

 
0.3

 
0.2

 
0.3

Diluted weighted average outstanding shares
125.8

 
129.9

 
128.1

 
130.0

Earnings per share:
 
 
 
 
 
 
 
Basic
$
1.60

 
$
1.69

 
$
1.50

 
$
4.83

Diluted
$
1.58

 
$
1.67

 
$
1.48

 
$
4.77