Derivative Instruments - Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 MWh MMBTU	Dec. 31, 2023 MWh MMBTU
Loss on non-trading derivatives, net | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	5,020	6,254
Loss on non-trading derivatives, net | Electricity
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) | MWh	807	1,029
Gain (loss) on trading derivatives, net | Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	630	1,016