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Derivative Financial Instruments - Narrative (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
counterparty
Dec. 31, 2024
USD ($)
Derivative [Line Items]    
Number of central counterparties | counterparty 2  
Notional value $ 584,169,000 $ 920,617,000
Derivative, fair value, amount offset against collateral, net 800,000 5,000,000
Estimated accumulated gain (loss) to be reclassified in next 12 months 6,000,000  
Cash collateral held relative to derivative exposure 0 0
Cash collateral pledged 800,000 $ 5,000,000
CME    
Derivative [Line Items]    
Notional value $ 563,000,000  
Percent of total notional derivative contracts 96.40%  
Amount of variation margin included as settlement $ (6,100,000)  
LCH    
Derivative [Line Items]    
Notional value $ 21,000,000  
Percent of total notional derivative contracts 3.60%  
Amount of variation margin included as settlement $ (100,000)