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Contractual Guarantees, Litigation, Investigations, and Insurance (Details)
$ in Millions, $ in Millions
12 Months Ended
Apr. 12, 2022
AUD ($)
Apr. 12, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 28, 2012
MW
Dec. 22, 2008
case
Loss Contingencies [Line Items]          
Recorded third-party environmental recoveries receivable     $ 27.0    
JKC Australia L N G Pty Limited          
Loss Contingencies [Line Items]          
Litigation settlement amount awarded to other party   $ 475.0      
General Electric And G E Electrical International Incorporation          
Loss Contingencies [Line Items]          
Plant capacity (in MW) | MW       360  
Litigation settlement amount awarded to other party $ 640        
Gain (loss) related to settlement     $ 91.3    
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG          
Loss Contingencies [Line Items]          
Number of cases | case         10
UGL Infrastructure Pty Limited | Consortium Agreement          
Loss Contingencies [Line Items]          
Ownership percentage       50.00%