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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
2 Months Ended 12 Months Ended
May 25, 2023
Feb. 23, 2021
Nov. 16, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Asset Acquisition [Line Items]            
Financing Receivable       $ 817.2 $ 0.0  
Progress Payments       665.1 0.0 $ 0.0
Proceeds from sale of assets and investments       25.4 46.2 37.5
Gain on exchange with joint venture partner       $ 0.0 $ 0.0 36.8
Gain on exchange with joint venture partner, after tax           $ 27.3
TIG - Portion of Business Acquired            
Asset 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        
Tyczka Industrie-Gases GmbH            
Asset Acquisition [Line Items]            
Ownership interest (percent) in former equity method investment         50.00%  
Gain from disposition of interest in equity method investment   $ 24.1        
Natural Gas-To-Syngas Processing Facility            
Asset Acquisition [Line Items]            
Price of acquisition $ 1,000.0          
Sales contract term       15 years    
Financing Receivable       $ 800.0    
Progress Payments       $ 600.0    
Natural Gas-To-Syngas Processing Facility | Subsequent event            
Asset Acquisition [Line Items]            
Progress Payments     $ 100.0