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Acquisitions (Narrative) (Details)
$ in Millions
12 Months Ended
Feb. 23, 2021
USD ($)
business_entity
Jul. 01, 2020
USD ($)
acquisition
Apr. 17, 2020
USD ($)
production_facility
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]            
Proceeds from sale of assets and investments       $ 46.2 $ 37.5 $ 80.3
Gain on exchange with joint venture partner       $ 0.0 36.8 $ 0.0
Gain on exchange with joint venture partner, after tax         $ 27.3  
Production Plants            
Business Acquisition [Line Items]            
Number of hydrogen production plants acquired | production_facility     5      
Acquisition of hydrogen production plants     $ 580.0      
TIG - Portion of Business Acquired            
Business Acquisition [Line Items]            
Ownership interest subsequent to acquisition date (percent) 100.00%          
Proceeds from sale of assets and investments $ 10.8          
Gain from revaluation of previously held equity interest to acquisition date fair value 12.7          
Acquisition date fair value of previously held equity interest $ 15.4          
Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Number of business combinations completed in period | acquisition   3        
Business combinations, aggregate purchase price, net of cash acquired   $ 185.4        
Tyczka Industrie-Gases GmbH            
Business Acquisition [Line Items]            
Ownership interest (percent) in former equity method investment         50.00%  
Number of businesses after separation | business_entity 2          
Gain from disposition of interest in equity method investment $ 24.1