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Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 7 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Allowance for doubtful accounts $ 20.1     $ 20.1   $ 17.1
Allowance for certain customer returns, rebates and incentives $ 10.2     $ 10.2   $ 8.7
Antidilutive share-based compensation awards (in shares) 1.8 0.9   1.8 0.9  
Capital expenditures in accounts payable or other current liabilities at period end       $ 12.4 $ 13.4  
Outstanding purchase of common stock recorded in accounts payable       $ 6.0 $ 22.6  
Scenario, Forecast | Sensia            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Payments to acquire interest in joint venture     $ 250.0      
Rockwell Automation, Inc. | Scenario, Forecast | Sensia            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Ownership percentage     53.00%      
Schlumberger | Scenario, Forecast | Sensia            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Noncontrolling interest, ownership percentage by noncontrolling owners     47.00%      
Sensia | Scenario, Forecast            
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]            
Revenues     $ 400.0