Derivative Instruments - Schedule of Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2025 MMBTU MWh	Jun. 30, 2024 MWh MMBTU
Gain (loss) on non-trading derivatives, net | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	5,327	5,716
Gain (loss) on non-trading derivatives, net | Electricity
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) | MWh	788	987
(Loss) gain on trading derivatives, net | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	1,883	2,988