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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 27, 2021
Sep. 27, 2021
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2015
Subsequent Event [Line Items]                
Payments for equity investment         $ 76.0 $ 24.4 $ 15.7  
Investments by noncontrolling interests         $ 136.6 $ 17.1 $ 0.0  
JIGPC                
Subsequent Event [Line Items]                
Investments by noncontrolling interests     $ 130.0          
JIGPC | Subsequent event                
Subsequent Event [Line Items]                
Payments for equity investment $ 1,600.0              
Ownership interest percentage 55.00%              
Ownership percentage attributable to noncontrolling partner 4.00%              
JIGPC | Forecast                
Subsequent Event [Line Items]                
Payments for equity investment       $ 1,000.0        
JGPC                
Subsequent Event [Line Items]                
Ownership interest percentage     26.00%   26.00%      
JIGPC | Aramco                
Subsequent Event [Line Items]                
Definitive agreement for acquisition of assets, value   $ 12,000.0            
Term of agreement to commission, operate, and maintain the project assets   25 years            
JIGPC | Aramco | Subsequent event                
Subsequent Event [Line Items]                
Acquisition of assets $ 7,000.0              
JGPC | Aramco                
Subsequent Event [Line Items]                
Term of oxygen and nitrogen supply agreement               20 years