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Commitments and Contingencies and Derivative Financial Instruments (Details)
$ in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 13, 2023
USD ($)
Apr. 12, 2022
USD ($)
Apr. 12, 2022
AUD ($)
Apr. 01, 2022
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
derivative_agreement
Sep. 28, 2012
MW
Dec. 22, 2008
case
JKC Australia LNG Pty Limited                
Loss Contingencies [Line Items]                
Settlement payment   $ 475.0            
UGL Infrastructure Pty Limited | Consortium Agreement                
Loss Contingencies [Line Items]                
Percentage of ownership interest in joint venture             50.00%  
General Electric and GE Electrical International Inc                
Loss Contingencies [Line Items]                
Plant capacity (in MW's) | MW             360  
Settlement payment     $ 640          
Litigation expenses included in segment profit       $ 91.3        
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG                
Loss Contingencies [Line Items]                
Number of pending claims | case               10
LOCs                
Loss Contingencies [Line Items]                
Aggregate principal balance of short-term debt         $ 326.2 $ 280.5    
Surety Bond                
Loss Contingencies [Line Items]                
Aggregate principal balance of short-term debt         2,000.0 $ 2,200.0    
Treasury Lock                
Loss Contingencies [Line Items]                
Number of instruments held | derivative_agreement           2    
Derivative notional amount           $ 500.0    
Gain on derivatives, before taxes $ 37.4              
Derivative assets (liabilities), at fair value           40.9    
Unrealized gain (loss) on derivatives         27.2 30.8    
Treasury Lock | Fixed Rate Date                
Loss Contingencies [Line Items]                
Aggregate principal amount $ 500.0         500.0    
Interest Rate Swap and Cross Currency Interest Rate Contract                
Loss Contingencies [Line Items]                
Derivative assets (liabilities), at fair value         107.4 128.2    
Unrealized gain (loss) on derivatives         81.5 87.5    
Interest Rate Swap                
Loss Contingencies [Line Items]                
Derivative notional amount         778.9      
Cross Currency Interest Rate Contract                
Loss Contingencies [Line Items]                
Derivative notional amount         $ 127.8      
Cross Currency Interest Rate Contract | Minimum                
Loss Contingencies [Line Items]                
Term of derivative contract         3 years 6 months      
Cross Currency Interest Rate Contract | Maximum                
Loss Contingencies [Line Items]                
Term of derivative contract         10 years      
Foreign Exchange Forward                
Loss Contingencies [Line Items]                
Derivative notional amount         $ 829.3 298.2    
Derivative assets (liabilities), at fair value         $ 15.9 $ (3.2)    
Foreign Exchange Forward | Minimum                
Loss Contingencies [Line Items]                
Term of derivative contract         1 month      
Foreign Exchange Forward | Maximum                
Loss Contingencies [Line Items]                
Term of derivative contract         12 months