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Financial Instruments - Narrative (Details)
3 Months Ended
Dec. 31, 2023
USD ($)
MMcf
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Derivative [Line Items]      
Purchase commitment volume | MMcf 20,045    
Contract netting $ 0   $ 0
Cash collateral 0   $ 0
Net (gain) loss on settled interest rate agreements (3,200,000) $ (700,000)  
Net realized gains in AOCI $ 222,300,000    
Not Designated As Hedges: | Gas Purchases | Commodity contracts      
Derivative [Line Items]      
Purchase commitment volume | MMcf 30,200    
Not Designated As Hedges: | Gas Purchases | Commodity contracts | Minimum      
Derivative [Line Items]      
Hedging percent 25.00%    
Not Designated As Hedges: | Gas Purchases | Commodity contracts | Maximum      
Derivative [Line Items]      
Hedging percent 50.00%