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Summarized Financial Information of Equity Affiliates (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 19, 2015
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]          
Dividends received from equity affiliates     $ 107.0 $ 144.3 $ 122.5
Investment in net assets of and advances to equity affiliates     1,432.2 1,276.2  
Goodwill associated with affiliate companies accounted for by equity method     50.0 42.8  
Proportionate share of accumulated dividend distribution taxes released per the India Finance Act   $ 33.8 33.8    
Reduction in equity affiliate income for impacts of the Tax Act         $ 28.5
Obligation for future contribution to equity affiliate to be funded in next twelve months     94.4 94.4  
Foreign affiliates          
Schedule of Equity Method Investments [Line Items]          
Investment in net assets of and advances to equity affiliates     $ 1,431.3 $ 1,275.4  
Jazan Gas Projects Company          
Schedule of Equity Method Investments [Line Items]          
Ownership interest percentage     26.00%    
Oxygen and nitrogen supply agreement, term 20 years        
Obligation for future contribution to equity affiliate to be funded in next twelve months     $ 94.4