Commitments and Contingencies - Comanche Unit 3 (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Cap of noneconomic loss in a civil action other than a medical malpractice under Colorado law	$ 0.6
Cap of noneconomic loss in a civil action (CORE withdrawal)	187.0
Cap of noneconomic loss in a civil action (CORE)	253.0
CORE outcome excluding interest	26.0
CORE outcome total	$ 34.0