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Derivative Financial Instruments - Narrative (Details)
 6 Months Ended
Jun. 30, 2025
USD ($)
counterparty
Dec. 31, 2024
USD ($)
Derivative [Line Items]    
Number of central counterparties | counterparty 2  
Notional value $ 601,560,000 $ 920,617,000
Derivative, fair value, amount offset against collateral, net 2,000,000 5,000,000
Estimated accumulated gain (loss) to be reclassified in next 12 months 11,000,000  
Cash collateral held relative to derivative exposure 0 0
Cash collateral pledged 2,000,000 $ 5,000,000
CME    
Derivative [Line Items]    
Notional value $ 566,000,000  
Percent of total notional derivative contracts 94.10%  
Amount of variation margin included as settlement $ (11,600,000)  
LCH    
Derivative [Line Items]    
Notional value $ 36,000,000  
Percent of total notional derivative contracts 5.90%  
Amount of variation margin included as settlement $ (300,000)