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Basis of Presentation and Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles basic and diluted EPS amounts (in millions, except per share amounts):
 
 
2020
 
2019
 
2018
Net income attributable to Rockwell Automation
 
$
1,023.4

 
$
695.8

 
$
535.5

Less: Allocation to participating securities
 
(1.0
)
 
(0.7
)
 
(0.5
)
Net income available to common shareowners
 
$
1,022.4

 
$
695.1

 
$
535.0

Basic weighted average outstanding shares
 
115.8

 
118.3

 
125.4

Effect of dilutive securities
 
 
 
 
 
 
Stock options
 
0.7

 
0.9

 
1.3

Performance shares
 
0.1

 
0.1

 
0.2

Diluted weighted average outstanding shares
 
116.6

 
119.3

 
126.9

Earnings per share:
 
 
 
 
 
 
Basic
 
$
8.83

 
$
5.88

 
$
4.27

Diluted
 
$
8.77

 
$
5.83

 
$
4.21