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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 7 Months Ended 12 Months Ended
Aug. 31, 2021
Oct. 01, 2019
Aug. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Sep. 30, 2019
Business Acquisition [Line Items]                  
Goodwill           $ 3,625.9 $ 1,650.3   $ 1,071.1
Sales             27.9    
Pro forma revenue           7,200.0 6,500.0    
Cash, net of cash acquired   $ 247.0              
Noncontrolling interest portion of Rockwell Automation's contributed business   25.8              
Software & Control                  
Business Acquisition [Line Items]                  
Goodwill           2,447.5      
Plex Systems                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life     12 years            
Customer attrition rate 5.00%                
Royalty rate 25.00%                
Obsolescence factor phase out period 10 years                
Goodwill $ 1,725.3   $ 1,725.3            
Plex Systems | Customer relationships                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired 276.4                
Plex Systems | Patented Technology                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired 232.8                
Plex Systems | Trade Names                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired $ 22.2                
Oylo And Fiix Inc.                  
Business Acquisition [Line Items]                  
Goodwill               $ 224.8  
Oylo And Fiix Inc. | Customer Relationships, Technology, and Trade Names                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired           $ 69.6      
Acquired finite-lived intangible assets, weighted average useful life           11 years      
Oylo And Fiix Inc. | Lifecycle Services                  
Business Acquisition [Line Items]                  
Goodwill           $ 12.8      
Oylo And Fiix Inc. | Software & Control                  
Business Acquisition [Line Items]                  
Goodwill           $ 212.0      
Sensia                  
Business Acquisition [Line Items]                  
Goodwill   $ 307.4              
Pro forma revenue             191.0    
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              
Sensia | Schlumberger                  
Business Acquisition [Line Items]                  
Business acquisition, percentage of voting interests acquired   47.00%              
Sensia | Minimum                  
Business Acquisition [Line Items]                  
Customer attrition rate   7.50%              
Sensia | Maximum                  
Business Acquisition [Line Items]                  
Customer attrition rate   25.00%              
Sensia | Customer Relationships, Technology, and Trade Names                  
Business Acquisition [Line Items]                  
Finite-lived intangible assets acquired   $ 254.1              
Acquired finite-lived intangible assets, weighted average useful life   11 years              
Sensia | Technology and Trademarks | Minimum                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life   5 years              
Sensia | Technology and Trademarks | Maximum                  
Business Acquisition [Line Items]                  
Acquired finite-lived intangible assets, weighted average useful life   15 years              
Avnet                  
Business Acquisition [Line Items]                  
Number of years of experience       20 years          
MESTECH, Avnet, ASEM, and Kalypso                  
Business Acquisition [Line Items]                  
Sales             41.8    
Pro forma revenue             $ 7,000.0    
Business acquisition, goodwill, expected tax deductible amount         $ 69.0        
Contingent consideration         25.8        
MESTECH, Avnet, ASEM, and Kalypso | Customer Relationships, Technology, and Trade Names                  
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 | Lifecycle Services                  
Business Acquisition [Line Items]                  
Goodwill         $ 83.3        
MESTECH, Avnet, ASEM, and Kalypso | Software & Control                  
Business Acquisition [Line Items]                  
Goodwill         $ 161.2