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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 01, 2019
Mar. 31, 2019
Mar. 31, 2019
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired 53.00%    
Cash $ 250.0    
Noncontrolling interest portion of Rockwell Automation's contributed business $ 293.8    
Schlumberger      
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired 47.00%    
Sensia      
Business Acquisition [Line Items]      
Cash $ 250.0    
Finite-lived intangible assets acquired, discount rate 11.00%    
Noncontrolling interest portion of Rockwell Automation's contributed business $ 21.5    
Pro forma revenue   $ 1,700.0 $ 3,400.0
Customer Relationships, Technology, Patents | Sensia      
Business Acquisition [Line Items]      
Finite-lived intangible assets acquired $ 254.1    
Acquired finite-lived intangible assets, weighted average useful life 11 years    
Minimum | Sensia      
Business Acquisition [Line Items]      
Customer attrition rate 7.50%    
Minimum | Technology and Trademarks | Sensia      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 5 years    
Maximum | Sensia      
Business Acquisition [Line Items]      
Customer attrition rate 25.00%    
Maximum | Technology and Trademarks | Sensia      
Business Acquisition [Line Items]      
Acquired finite-lived intangible assets, weighted average useful life 15 years