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Financial Instruments - Narrative (Details)
3 Months Ended
Dec. 31, 2022
USD ($)
MMcf
Dec. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
Derivative [Line Items]      
Energy measure | MMcf 12,039    
Contract netting $ 0   $ 0
Cash collateral 0   $ 0
Net (gain) loss on settled interest rate agreements (700,000) $ 1,000,000  
Net realized gains in AOCI $ 93,600,000    
Gas Purchases | Not Designated As Hedges: | Commodity contracts      
Derivative [Line Items]      
Hedging percent 32.00%    
Energy measure | MMcf 17,700    
Minimum | Gas Purchases | Not Designated As Hedges: | Commodity contracts      
Derivative [Line Items]      
Hedging percent 25.00%    
Maximum | Gas Purchases | Not Designated As Hedges: | Commodity contracts      
Derivative [Line Items]      
Hedging percent 50.00%