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Equity Affiliates (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2015
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]              
Investment in net assets of and advances to equity affiliates     $ 4,792.5 $ 4,617.8      
Dividends and other distributions received from equity affiliates     441.7 344.3 $ 285.1    
Goodwill associated with affiliate companies accounted for by equity method     $ 38.7 41.3      
Equity method investment impairment charge         14.8    
Jazan Integrated Gasification and Power Company ("JIGPC")              
Schedule of Equity Method Investments [Line Items]              
Payments for equity investment $ 1,600.0 $ 908.0          
Ownership interest percentage 55.00%   55.00%        
Investment balance     $ 2,871.2 $ 2,862.2      
Jazan Integrated Gasification and Power Company ("JIGPC") | Non-controlling Interests              
Schedule of Equity Method Investments [Line Items]              
Payments for equity investment $ 130.0 $ 73.0          
Ownership percentage attributable to noncontrolling partner 4.00%   4.00%        
Jazan Gas Project Company ("JGPC")              
Schedule of Equity Method Investments [Line Items]              
Ownership interest percentage     26.00%        
Jazan Gas Project Company ("JGPC") | Aramco              
Schedule of Equity Method Investments [Line Items]              
Term of oxygen and nitrogen supply agreement           20 years  
Obligation for equity contributions based on share of advances received by joint venture under bridge loan              
Schedule of Equity Method Investments [Line Items]              
Obligation for future contribution to equity affiliate         0.0   $ 0.0
Noncash adjustment for reduction of contractual obligation         $ 94.4