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ARO Trust (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Investments within the ARO Trust were as follows (in millions):


			March 31, 2024												December 31, 2023
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	26.7					$	26.7					$	25.5					$	25.5
U.S. Equity Funds			52.7						130.7						52.7						119.8
International Equity Funds			31.7						40.9						31.7						39.2
Municipal Bond Funds			87.7						83.8						87.7						84.4
Total			$	198.8					$	282.1					$	197.6					$	268.9