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Acquisitions (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 23, 2021
USD ($)
business_entity
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
Business Acquisition [Line Items]            
Proceeds from sale of assets and investments       $ 32.8 $ 30.0  
Gain on exchange with joint venture partner   $ 0.0 $ 0.0 $ 0.0 36.8  
Gain on exchange with joint venture partner, after tax         $ 27.3  
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          
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