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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 7 Months Ended 12 Months Ended
Oct. 01, 2019
Jan. 31, 2020
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]            
Goodwill       $ 1,650.3 $ 1,071.1 $ 1,075.5
Architecture & Software            
Business Acquisition [Line Items]            
Goodwill       609.4 432.3 422.3
Control Products & Solutions            
Business Acquisition [Line Items]            
Goodwill       1,040.9 $ 638.8 $ 653.2
Sensia            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interests acquired 53.00%          
Cash, net of cash acquired $ 247.0          
Finite-lived intangible assets acquired, discount rate 11.00%          
Noncontrolling interest portion of Rockwell Automation's contributed business $ 293.8          
Pro forma revenue       191.0    
Goodwill $ 307.4          
Sensia | Schlumberger            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interests acquired 47.00%          
Sensia | Customer Relationships, Technology, Patents            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired $ 254.1          
Acquired finite-lived intangible assets, weighted average useful life 11 years          
Sensia | Minimum            
Business Acquisition [Line Items]            
Customer attrition rate 7.50%          
Sensia | Minimum | Technology and Trademarks            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life 5 years          
Sensia | Maximum            
Business Acquisition [Line Items]            
Customer attrition rate 25.00%          
Sensia | Maximum | Technology and Trademarks            
Business Acquisition [Line Items]            
Acquired finite-lived intangible assets, weighted average useful life 15 years          
MESTECH, Avnet, ASEM, and Kalypso            
Business Acquisition [Line Items]            
Pro forma revenue       7,000.0    
Goodwill     $ 244.5      
Business acquisition, goodwill, expected tax deductible amount     69.0      
Contingent consideration     25.8      
Sales       $ 41.8    
MESTECH, Avnet, ASEM, and Kalypso | Customer Relationships, Technology, Patents            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired     $ 76.5      
Acquired finite-lived intangible assets, weighted average useful life     10 years      
MESTECH, Avnet, ASEM, and Kalypso | Architecture & Software            
Business Acquisition [Line Items]            
Goodwill     $ 161.2      
MESTECH, Avnet, ASEM, and Kalypso | Control Products & Solutions            
Business Acquisition [Line Items]            
Goodwill     $ 83.3      
Avnet            
Business Acquisition [Line Items]            
Number of years of experience   20 years