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Equity Affiliates (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 27, 2021
Sep. 27, 2021
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]                
Investment in net assets of and advances to equity affiliates         $ 3,353.8 $ 1,649.3    
Dividends and other distributions received from equity affiliates         285.1 157.3 $ 107.0  
Goodwill associated with affiliate companies accounted for by equity method         44.6 55.3    
Payments for equity investment         1,658.4 76.0 24.4  
Equity method investment impairment charge         $ 14.8      
Proportionate share of accumulated dividend distribution taxes released per the India Finance Act             $ 33.8  
Jazan Integrated Gasification and Power Company ("JIGPC")                
Schedule of Equity Method Investments [Line Items]                
Payments for equity investment $ 1,600.0              
Ownership interest percentage 55.00%       55.00%      
Investment balance         $ 1,780.0      
Jazan Integrated Gasification and Power Company ("JIGPC") | Non-controlling Interests                
Schedule of Equity Method Investments [Line Items]                
Payments for equity investment $ 130.0              
Ownership interest percentage 4.00%       4.00%      
Jazan Integrated Gasification and Power Company ("JIGPC") | Forecast                
Schedule of Equity Method Investments [Line Items]                
Payments for equity investment       $ 1,000.0        
Jazan Gas Project Company ("JGPC")                
Schedule of Equity Method Investments [Line Items]                
Ownership interest percentage         26.00%      
Investment balance         $ 0.0      
Jazan Integrated Gasification and Power Company ("JIGPC") | Aramco                
Schedule of Equity Method Investments [Line Items]                
Definitive agreement for acquisition of assets, value   $ 12,000.0            
Acquisition of assets $ 7,000.0              
Term of agreement to commission, operate, and maintain the project assets   25 years            
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 $ 94.4    
Noncash adjustment for reduction of contractual obligation     $ 94.4