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Acquisitions - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 9 Months Ended
Oct. 01, 2019
USD ($)
Jan. 31, 2020
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
acquisition
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]              
Business acquisition, percentage of voting interests acquired 53.00%            
Goodwill     $ 1,631.0     $ 1,631.0 $ 1,071.1
Architecture & Software              
Business Acquisition [Line Items]              
Goodwill     600.5     600.5 432.3
Control Products & Solutions              
Business Acquisition [Line Items]              
Goodwill     1,030.5     1,030.5 $ 638.8
Sensia              
Business Acquisition [Line Items]              
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 $ 26.6     $ 293.8      
Pro forma revenue     37.8     160.8  
Goodwill $ 307.5            
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     1,800.0     $ 5,200.0  
Goodwill         $ 244.4    
Business acquisition, goodwill, expected tax deductible amount         68.9    
Contingent consideration         25.8    
Number of business acquisitions | acquisition           4  
Sales     $ 15.5     $ 18.6  
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         $ 161.3    
MESTECH, Avnet, ASEM, and Kalypso | Control Products & Solutions              
Business Acquisition [Line Items]              
Goodwill         $ 83.1    
Avnet              
Business Acquisition [Line Items]              
Number of years of experience   20 years